diff --git a/src/services/CalendarService.ts b/src/services/CalendarService.ts
index 46e2931..74c665b 100644
--- a/src/services/CalendarService.ts
+++ b/src/services/CalendarService.ts
@@ -13,6 +13,8 @@ export interface CalendarEvent {
   description?: string;
   location?: string;
   source: string;
+  sourceId: string; // Unique identifier for the calendar source
+  color?: string; // Color assigned to this event's calendar
 }
 
 interface CacheData {
@@ -474,6 +476,8 @@ export class CalendarService {
           description: event.description,
           location: event.location,
           source: source.name,
+          sourceId: source.url, // Using URL as unique identifier
+          color: source.color,
         });
       }
     }
@@ -497,6 +501,8 @@ export class CalendarService {
       description: event.description,
       location: event.location,
       source: source.name,
+      sourceId: source.url, // Using URL as unique identifier
+      color: source.color,
     }];
   }
 
@@ -567,6 +573,8 @@ export class CalendarService {
         description: exception.description,
         location: exception.location,
         source: source.name,
+        sourceId: source.url, // Using URL as unique identifier
+        color: source.color,
       };
     }
 
diff --git a/src/services/IcsImportService.ts b/src/services/IcsImportService.ts
index bec6183..c58ad3a 100644
--- a/src/services/IcsImportService.ts
+++ b/src/services/IcsImportService.ts
@@ -39,7 +39,8 @@ export class IcsImportService {
         end: endDate,
         description: event.description,
         location: event.location,
-        source: "Imported"
+        source: "Imported",
+        sourceId: "imported" // Special source ID for imported events
       };
     } catch (error) {
       if (error instanceof Error) {
diff --git a/src/settings/SettingsTab.ts b/src/settings/SettingsTab.ts
index 8e78847..6886e5a 100644
--- a/src/settings/SettingsTab.ts
+++ b/src/settings/SettingsTab.ts
@@ -13,6 +13,7 @@ import {
 } from "obsidian";
 import MemoChron from "../main";
 import { CalendarSource } from "./types";
+import { CALENDAR_COLOR_PALETTE } from "../utils/constants";
 
 export class SettingsTab extends PluginSettingTab {
   constructor(
@@ -50,6 +51,7 @@ export class SettingsTab extends PluginSettingTab {
   private renderGeneralSection(): void {
     this.renderFirstDayOfWeek();
     this.renderHideCalendar();
+    this.renderEnableCalendarColors();
     this.renderRefreshInterval();
   }
 
@@ -72,26 +74,57 @@ export class SettingsTab extends PluginSettingTab {
   }
 
   private async addNewCalendar(): Promise<void> {
-    this.plugin.settings.calendarUrls.push({
+    const newCalendar: CalendarSource = {
       url: "",
       name: "New calendar",
       enabled: true,
       tags: [],
-    });
+    };
+
+    // Auto-assign color if colors are enabled
+    if (this.plugin.settings.enableCalendarColors) {
+      newCalendar.color = this.getNextAvailableColor();
+    }
+
+    this.plugin.settings.calendarUrls.push(newCalendar);
     await this.plugin.saveSettings();
     this.display();
   }
 
+  private getNextAvailableColor(): string {
+    const usedColors = this.plugin.settings.calendarUrls
+      .map(source => source.color)
+      .filter(color => color);
+
+    // Find the first unused color in the palette
+    for (const color of CALENDAR_COLOR_PALETTE) {
+      if (!usedColors.includes(color)) {
+        return color;
+      }
+    }
+
+    // If all colors are used, cycle back to the beginning
+    const index = this.plugin.settings.calendarUrls.length % CALENDAR_COLOR_PALETTE.length;
+    return CALENDAR_COLOR_PALETTE[index];
+  }
+
   private renderCalendarSource(
     container: HTMLElement, 
     source: CalendarSource, 
     index: number
   ): void {
-    new Setting(container)
+    const setting = new Setting(container)
       .addText((text) => this.setupUrlInput(text, source, index))
       .addButton((btn) => this.setupFilePickerButton(btn, index))
       .addText((text) => this.setupNameInput(text, source, index))
-      .addText((text) => this.setupTagsInput(text, source, index))
+      .addText((text) => this.setupTagsInput(text, source, index));
+    
+    // Add color picker if colors are enabled
+    if (this.plugin.settings.enableCalendarColors) {
+      setting.addButton((btn) => this.setupColorPicker(btn, source, index));
+    }
+    
+    setting
       .addToggle((toggle) => this.setupEnabledToggle(toggle, source, index))
       .addButton((btn) => this.setupRemoveButton(btn, index));
   }
@@ -184,6 +217,42 @@ export class SettingsTab extends PluginSettingTab {
     });
   }
 
+  private setupColorPicker(
+    btn: ButtonComponent,
+    source: CalendarSource,
+    index: number
+  ): ButtonComponent {
+    const currentColor = source.color || CALENDAR_COLOR_PALETTE[index % CALENDAR_COLOR_PALETTE.length];
+    
+    return btn
+      .setButtonText("Color")
+      .setTooltip("Choose calendar color")
+      .onClick(() => {
+        this.showColorPicker(source, index, btn);
+      })
+      .then((button) => {
+        // Add a visual color indicator
+        this.updateColorButton(button.buttonEl, currentColor);
+        return button;
+      });
+  }
+
+  private updateColorButton(buttonEl: HTMLElement, color: string) {
+    buttonEl.style.setProperty("--selected-color", color);
+    buttonEl.classList.add("memochron-color-button");
+  }
+
+  private showColorPicker(source: CalendarSource, index: number, button: ButtonComponent) {
+    const modal = new ColorPickerModal(this.app, source.color || CALENDAR_COLOR_PALETTE[0], async (selectedColor) => {
+      this.plugin.settings.calendarUrls[index].color = selectedColor;
+      await this.plugin.saveSettings();
+      // Force refresh to update event colors
+      await this.plugin.refreshCalendarView(true);
+      this.updateColorButton(button.buttonEl, selectedColor);
+    });
+    modal.open();
+  }
+
   private renderFirstDayOfWeek(): void {
     const weekdays = [
       { value: "0", label: "Sunday" },
@@ -228,6 +297,32 @@ export class SettingsTab extends PluginSettingTab {
       );
   }
 
+  private renderEnableCalendarColors(): void {
+    new Setting(this.containerEl)
+      .setName("Enable calendar colors")
+      .setDesc("Show calendars in different colors for easy identification")
+      .addToggle((toggle) =>
+        toggle
+          .setValue(this.plugin.settings.enableCalendarColors)
+          .onChange(async (value) => {
+            this.plugin.settings.enableCalendarColors = value;
+            
+            // Auto-assign colors to existing calendars if enabling
+            if (value) {
+              this.plugin.settings.calendarUrls.forEach((source, index) => {
+                if (!source.color) {
+                  source.color = CALENDAR_COLOR_PALETTE[index % CALENDAR_COLOR_PALETTE.length];
+                }
+              });
+            }
+            
+            await this.plugin.saveSettings();
+            await this.plugin.refreshCalendarView(true); // Force refresh to update colors
+            this.display(); // Refresh settings display to show/hide color pickers
+          })
+      );
+  }
+
   private renderRefreshInterval(): void {
     new Setting(this.containerEl)
       .setName("Refresh interval")
@@ -578,4 +673,55 @@ class FilePickerModal extends SuggestModal<TFile> {
   onChooseSuggestion(file: TFile) {
     this.onChoose(file);
   }
+}
+
+// Color picker modal for calendar colors
+class ColorPickerModal extends Modal {
+  constructor(
+    app: App,
+    private currentColor: string,
+    private onChoose: (color: string) => void
+  ) {
+    super(app);
+  }
+
+  onOpen() {
+    const { contentEl } = this;
+    contentEl.empty();
+
+    contentEl.createEl("h3", { text: "Choose Calendar Color" });
+
+    const colorGrid = contentEl.createEl("div", { cls: "memochron-color-grid" });
+
+    const colorNames = [
+      "Red", "Blue", "Green", "Purple", 
+      "Orange", "Yellow", "Pink", "Cyan"
+    ];
+
+    CALENDAR_COLOR_PALETTE.forEach((color, index) => {
+      const colorButton = colorGrid.createEl("button", {
+        cls: "memochron-color-option",
+        attr: { title: colorNames[index] }
+      });
+      
+      colorButton.style.setProperty("--color", color);
+      
+      if (color === this.currentColor) {
+        colorButton.classList.add("selected");
+      }
+      
+      colorButton.addEventListener("click", () => {
+        this.onChoose(color);
+        this.close();
+      });
+      
+      // Add color name label
+      colorButton.createEl("span", { text: colorNames[index] });
+    });
+  }
+
+  onClose() {
+    const { contentEl } = this;
+    contentEl.empty();
+  }
 }
\ No newline at end of file
diff --git a/src/settings/types.ts b/src/settings/types.ts
index 7d2c274..a405928 100644
--- a/src/settings/types.ts
+++ b/src/settings/types.ts
@@ -16,6 +16,7 @@ export interface CalendarSource {
   name: string;
   enabled: boolean;
   tags: string[];
+  color?: string; // Optional color for this calendar
 }
 
 export interface MemoChronSettings {
@@ -30,6 +31,7 @@ export interface MemoChronSettings {
   firstDayOfWeek: number; // 0 = Sunday, 1 = Monday, etc.
   hideCalendar: boolean;
   folderPathTemplate: string; // Template for organizing notes in date-based subfolders
+  enableCalendarColors: boolean; // Global toggle for calendar colors feature
 }
 
 export const DEFAULT_SETTINGS: MemoChronSettings = {
@@ -56,4 +58,5 @@ export const DEFAULT_SETTINGS: MemoChronSettings = {
   firstDayOfWeek: DEFAULT_FIRST_DAY_OF_WEEK,
   hideCalendar: false,
   folderPathTemplate: "", // Empty by default for backwards compatibility
+  enableCalendarColors: false, // Disabled by default
 };
diff --git a/src/utils/constants.ts b/src/utils/constants.ts
index 100f659..bc66649 100644
--- a/src/utils/constants.ts
+++ b/src/utils/constants.ts
@@ -20,4 +20,17 @@ export const TEMPLATE_VARIABLES = {
     DATE: '{{date}}',
     DESCRIPTION: '{{description}}',
     LOCATION: '{{location}}',
-};
\ No newline at end of file
+};
+
+// Color palette for auto-assigning calendar colors
+// Using CSS variables that work well with Obsidian themes
+export const CALENDAR_COLOR_PALETTE = [
+    'var(--color-red)',
+    'var(--color-blue)',
+    'var(--color-green)',
+    'var(--color-purple)',
+    'var(--color-orange)',
+    'var(--color-yellow)',
+    'var(--color-pink)',
+    'var(--color-cyan)',
+];
\ No newline at end of file
diff --git a/src/views/CalendarView.ts b/src/views/CalendarView.ts
index 72a2858..3aa91f3 100644
--- a/src/views/CalendarView.ts
+++ b/src/views/CalendarView.ts
@@ -57,6 +57,9 @@ export class CalendarView extends ItemView {
     );
     this.renderMonth();
     
+    // Update calendar visibility based on current settings
+    this.updateCalendarVisibility();
+    
     // Always show agenda for selected date or today
     const dateToShow = this.selectedDate || new Date();
     this.showDayAgenda(dateToShow);
@@ -285,10 +288,38 @@ export class CalendarView extends ItemView {
     
     if (events.length > 0) {
       dayEl.addClass("has-events");
-      dayEl.createEl("div", {
-        cls: "memochron-event-dot",
-        text: "•",
-      });
+      
+      if (this.plugin.settings.enableCalendarColors) {
+        // Group events by calendar source to show one dot per calendar
+        const eventsBySource = new Map<string, CalendarEvent>();
+        events.forEach(event => {
+          if (!eventsBySource.has(event.sourceId)) {
+            eventsBySource.set(event.sourceId, event);
+          }
+        });
+        
+        // Create a container for dots
+        const dotsContainer = dayEl.createEl("div", {
+          cls: "memochron-event-dots-container"
+        });
+        
+        // Add a colored dot for each calendar that has events
+        eventsBySource.forEach(event => {
+          const dot = dotsContainer.createEl("div", {
+            cls: "memochron-event-dot colored",
+            text: "•",
+          });
+          if (event.color) {
+            dot.style.color = event.color;
+          }
+        });
+      } else {
+        // Single dot for all events when colors are disabled
+        dayEl.createEl("div", {
+          cls: "memochron-event-dot",
+          text: "•",
+        });
+      }
     }
   }
 
@@ -342,6 +373,12 @@ export class CalendarView extends ItemView {
       eventEl.addClass("past-event");
     }
 
+    // Add colored left border if colors are enabled
+    if (this.plugin.settings.enableCalendarColors && event.color) {
+      eventEl.addClass("with-color");
+      eventEl.style.setProperty("--event-color", event.color);
+    }
+
     this.renderEventTime(eventEl, event);
     this.renderEventTitle(eventEl, event);
     this.renderEventLocation(eventEl, event);
diff --git a/styles.css b/styles.css
index 267d48e..974620d 100644
--- a/styles.css
+++ b/styles.css
@@ -153,6 +153,21 @@
   margin-bottom: 4px;
 }
 
+/* Colored dots container */
+.memochron-event-dots-container {
+  display: flex;
+  gap: 2px;
+  justify-content: center;
+  flex-wrap: wrap;
+  margin-top: 2px;
+}
+
+.memochron-event-dot.colored {
+  font-size: 1em;
+  height: auto;
+  margin-bottom: 0;
+}
+
 /* Week View */
 .memochron-week-grid {
   display: grid;
@@ -274,18 +289,108 @@
   border-radius: var(--radius-s);
   cursor: pointer;
   font-size: 0.9em;
+  position: relative;
+  overflow: hidden;
 }
 
 .memochron-agenda-event:hover {
   background: var(--background-modifier-hover);
 }
 
+/* Colored left border for events */
+.memochron-agenda-event.with-color {
+  padding-left: calc(var(--memochron-padding-sm) + 4px);
+}
+
+.memochron-agenda-event.with-color::before {
+  content: "";
+  position: absolute;
+  left: 0;
+  top: 0;
+  bottom: 0;
+  width: 4px;
+  background-color: var(--event-color);
+  border-radius: var(--radius-s) 0 0 var(--radius-s);
+}
+
 /* Grey out past events in agenda view */
 .memochron-agenda-event.past-event {
   opacity: 0.8;
   color: var(--text-muted);
 }
 
+/* Color picker styles */
+.memochron-color-button {
+  position: relative;
+}
+
+.memochron-color-button::after {
+  content: "";
+  position: absolute;
+  right: 4px;
+  top: 50%;
+  transform: translateY(-50%);
+  width: 12px;
+  height: 12px;
+  border-radius: 50%;
+  background-color: var(--selected-color);
+  border: 1px solid var(--background-modifier-border);
+}
+
+.memochron-color-grid {
+  display: grid;
+  grid-template-columns: repeat(4, 1fr);
+  gap: var(--size-4-2);
+  margin: var(--size-4-4) 0;
+}
+
+.memochron-color-option {
+  display: flex;
+  align-items: center;
+  justify-content: center;
+  padding: var(--size-4-3);
+  border: 2px solid var(--background-modifier-border);
+  border-radius: var(--radius-m);
+  background: var(--background-primary);
+  cursor: pointer;
+  transition: all 0.2s ease;
+  min-height: 50px;
+  position: relative;
+}
+
+.memochron-color-option::before {
+  content: "";
+  position: absolute;
+  left: var(--size-4-2);
+  top: 50%;
+  transform: translateY(-50%);
+  width: 16px;
+  height: 16px;
+  border-radius: 50%;
+  background-color: var(--color);
+  border: 1px solid var(--background-modifier-border);
+}
+
+.memochron-color-option span {
+  margin-left: var(--size-4-6);
+  font-size: 0.9em;
+  color: var(--text-normal);
+}
+
+.memochron-color-option:hover {
+  border-color: var(--interactive-accent);
+  background: var(--background-modifier-hover);
+}
+
+.memochron-color-option.selected {
+  border-color: var(--interactive-accent);
+  background: var(--interactive-accent);
+}
+
+.memochron-color-option.selected span {
+  color: var(--text-on-accent);
+}
+
 .memochron-event-time {
   color: var(--text-muted);
   font-size: 0.85em;
@@ -323,6 +428,75 @@
   border-bottom: none;
 }
 
+/* Improve calendar source settings layout */
+.memochron-calendar-list .setting-item {
+  min-height: auto;
+}
+
+.memochron-calendar-list .setting-item .setting-item-control {
+  display: flex;
+  flex-wrap: wrap;
+  gap: var(--size-4-2);
+  align-items: flex-start;
+  min-height: 2.5rem;
+}
+
+.memochron-calendar-list .setting-item .setting-item-control > * {
+  margin: 0 !important;
+}
+
+/* URL input should be wider */
+.memochron-calendar-list .setting-item input[type="text"]:first-of-type {
+  min-width: 200px;
+  flex: 2;
+}
+
+/* Name input */
+.memochron-calendar-list .setting-item input[type="text"]:nth-of-type(2) {
+  min-width: 100px;
+  flex: 1;
+}
+
+/* Tags input */
+.memochron-calendar-list .setting-item input[type="text"]:nth-of-type(3) {
+  min-width: 80px;
+  flex: 1;
+}
+
+/* Color button styling */
+.memochron-color-button {
+  min-width: 70px;
+  flex-shrink: 0;
+}
+
+/* File picker button */
+.memochron-calendar-list .setting-item button[aria-label*="folder"] {
+  flex-shrink: 0;
+}
+
+/* Toggle and remove buttons */
+.memochron-calendar-list .setting-item .checkbox-container,
+.memochron-calendar-list .setting-item button:last-child {
+  flex-shrink: 0;
+}
+
+/* Force break to new line when needed */
+@media screen and (max-width: 1200px) {
+  .memochron-calendar-list .setting-item .setting-item-control {
+    flex-direction: column;
+    align-items: stretch;
+  }
+  
+  .memochron-calendar-list .setting-item .setting-item-control > * {
+    width: 100%;
+    margin-bottom: var(--size-4-1) !important;
+  }
+  
+  .memochron-calendar-list .setting-item input[type="text"] {
+    min-width: auto;
+  }
+}
+
 .memochron-setting-item-container {
   position: relative;
 }