diff --git a/__test__/features/Events/eventUtils.test.ts b/__test__/features/Events/eventUtils.test.ts
index 74812fd..822d4e1 100644
--- a/__test__/features/Events/eventUtils.test.ts
+++ b/__test__/features/Events/eventUtils.test.ts
@@ -76,6 +76,80 @@ describe("parseCalendarEvent", () => {
     ]);
   });
 
+  it("dedupes attendees addresses correctly", () => {
+    const rawData = [
+      ["UID", {}, "text", "event-1"],
+      ["DTSTART", {}, "date-time", "2025-07-18T09:00:00Z"],
+      ["DTEND", {}, "date-time", "2025-07-18T10:00:00Z"],
+      ["SUMMARY", {}, "text", "Team Meeting"],
+      ["DESCRIPTION", {}, "text", "Discuss roadmap"],
+      ["LOCATION", {}, "text", "Zoom"],
+      ["ORGANIZER", { cn: "Alice" }, "cal-address", "alice@example.com"],
+      [
+        "ATTENDEE",
+        { cn: "Bob", partstat: "ACCEPTED" },
+        "cal-address",
+        "bob@example.com",
+      ],
+      [
+        "ATTENDEE",
+        { cn: "Bob", partstat: "ACCEPTED" },
+        "cal-address",
+        "bob@example.com",
+      ],
+      [
+        "ATTENDEE",
+        { cn: "Bob", partstat: "ACCEPTED" },
+        "cal-address",
+        "bob@example.com",
+      ],
+      ["X-OPENPAAS-VIDEOCONFERENCE", {}, "text", "https://meet.link"],
+      ["STATUS", {}, "text", "CONFIRMED"],
+      ["SEQUENCE", {}, "integer", "2"],
+      ["TRANSP", {}, "text", "OPAQUE"],
+      ["CLASS", {}, "text", "PUBLIC"],
+      ["DTSTAMP", {}, "date-time", "2025-07-18T08:00:00Z"],
+    ] as VObjectProperty[];
+
+    const result = parseCalendarEvent(
+      rawData,
+      baseColor,
+      calendar,
+      "/calendars/test.ics"
+    );
+
+    expect(result.uid).toBe("event-1");
+    expect(result.title).toBe("Team Meeting");
+    expect(result.description).toBe("Discuss roadmap");
+    expect(result.location).toBe("Zoom");
+    expect(result.start).toBe("2025-07-18T09:00:00Z");
+    expect(result.end).toBe("2025-07-18T10:00:00Z");
+    expect(result.stamp).toBe("2025-07-18T08:00:00Z");
+    expect(result.sequence).toBe(2);
+    expect(result.color).toBe(baseColor);
+    expect(result.status).toBe("CONFIRMED");
+    expect(result.transp).toBe("OPAQUE");
+    expect(result.class).toBe("PUBLIC");
+    expect(result.x_openpass_videoconference).toBe("https://meet.link");
+    expect(result.timezone).not.toBeDefined();
+
+    expect(result.organizer).toEqual({
+      cn: "Alice",
+      cal_address: "alice@example.com",
+    });
+
+    expect(result.attendee).toEqual([
+      {
+        cn: "Bob",
+        cal_address: "bob@example.com",
+        partstat: "ACCEPTED",
+        cutype: "INDIVIDUAL",
+        role: "REQ-PARTICIPANT",
+        rsvp: "FALSE",
+      },
+    ]);
+  });
+
   it("parses a full event correctly", () => {
     const rawData = [
       ["UID", {}, "text", "event-1"],
diff --git a/src/components/Attendees/PeopleSearch.tsx b/src/components/Attendees/PeopleSearch.tsx
index 93d017f..759288e 100644
--- a/src/components/Attendees/PeopleSearch.tsx
+++ b/src/components/Attendees/PeopleSearch.tsx
@@ -297,11 +297,16 @@ export function PeopleSearch({
             return;
           }
           setInputError(null);
-          const mapped = value.map((v: string | User) =>
-            typeof v === "string"
-              ? { email: v.trim(), displayName: v.trim() }
-              : v
-          );
+          const mapped = value
+            .map((v: string | User) =>
+              typeof v === "string"
+                ? { email: v.trim(), displayName: v.trim() }
+                : v
+            )
+            .filter(
+              (user, index, self) =>
+                self.findIndex((u) => u.email === user.email) === index
+            );
           onChange(event, mapped);
         }}
         slotProps={{
diff --git a/src/features/Events/eventUtils.ts b/src/features/Events/eventUtils.ts
index a8b89f1..112f5fe 100644
--- a/src/features/Events/eventUtils.ts
+++ b/src/features/Events/eventUtils.ts
@@ -110,16 +110,23 @@ export function parseCalendarEvent(
       }
       case "attendee": {
         const paramsObj = params as Record<string, string>;
-        (event.attendee as userAttendee[]).push(
-          createAttendee({
-            cn: paramsObj?.cn,
-            cal_address: String(value).replace(/^mailto:/i, ""),
-            partstat: paramsObj?.partstat as userAttendee["partstat"],
-            rsvp: paramsObj?.rsvp as userAttendee["rsvp"],
-            role: paramsObj?.role as userAttendee["role"],
-            cutype: paramsObj?.cutype as userAttendee["cutype"],
-          })
-        );
+        if (
+          !event.attendee?.find(
+            (attendee) =>
+              attendee.cal_address === String(value).replace(/^mailto:/i, "")
+          )
+        ) {
+          (event.attendee as userAttendee[]).push(
+            createAttendee({
+              cn: paramsObj?.cn,
+              cal_address: String(value).replace(/^mailto:/i, ""),
+              partstat: paramsObj?.partstat as userAttendee["partstat"],
+              rsvp: paramsObj?.rsvp as userAttendee["rsvp"],
+              role: paramsObj?.role as userAttendee["role"],
+              cutype: paramsObj?.cutype as userAttendee["cutype"],
+            })
+          );
+        }
         break;
       }
       case "dtstamp":