diff --git a/src/mail/actions/calendar_invite.py b/src/mail/actions/calendar_invite.py
new file mode 100644
index 0000000..bf11324
--- /dev/null
+++ b/src/mail/actions/calendar_invite.py
@@ -0,0 +1,237 @@
+"""Calendar invite actions for mail app.
+
+Allows responding to calendar invites directly from email.
+"""
+
+import asyncio
+import logging
+import re
+from typing import Optional, Tuple
+
+logger = logging.getLogger(__name__)
+
+
+def detect_calendar_invite(message_content: str, headers: dict) -> Optional[str]:
+    """Detect if a message is a calendar invite and extract event ID if possible.
+
+    Calendar invites from Microsoft/Outlook typically have:
+    - Content-Type: text/calendar or multipart with text/calendar part
+    - Meeting ID patterns in the content
+    - Teams/Outlook meeting links
+
+    Args:
+        message_content: The message body content
+        headers: Message headers
+
+    Returns:
+        Event identifier hint if detected, None otherwise
+    """
+    # Check for calendar-related content patterns
+    calendar_patterns = [
+        r"Microsoft Teams meeting",
+        r"Join the meeting",
+        r"Meeting ID:",
+        r"teams\.microsoft\.com/l/meetup-join",
+        r"Accept\s+Tentative\s+Decline",
+        r"VEVENT",
+        r"BEGIN:VCALENDAR",
+    ]
+
+    content_lower = message_content.lower() if message_content else ""
+
+    for pattern in calendar_patterns:
+        if re.search(pattern, message_content or "", re.IGNORECASE):
+            return "calendar_invite_detected"
+
+    return None
+
+
+async def find_event_by_subject(
+    subject: str, organizer_email: Optional[str] = None
+) -> Optional[dict]:
+    """Find a calendar event by subject and optionally organizer.
+
+    Args:
+        subject: Event subject to search for
+        organizer_email: Optional organizer email to filter by
+
+    Returns:
+        Event dict if found, None otherwise
+    """
+    try:
+        from src.services.microsoft_graph.auth import get_access_token
+        from src.services.microsoft_graph.client import fetch_with_aiohttp
+        from datetime import datetime, timedelta
+
+        scopes = ["https://graph.microsoft.com/Calendars.Read"]
+        _, headers = get_access_token(scopes)
+
+        # Search for events in the next 60 days with matching subject
+        start_date = datetime.now()
+        end_date = start_date + timedelta(days=60)
+
+        start_str = start_date.strftime("%Y-%m-%dT00:00:00Z")
+        end_str = end_date.strftime("%Y-%m-%dT23:59:59Z")
+
+        # URL encode the subject for the filter
+        subject_escaped = subject.replace("'", "''")
+
+        url = (
+            f"https://graph.microsoft.com/v1.0/me/calendarView?"
+            f"startDateTime={start_str}&endDateTime={end_str}&"
+            f"$filter=contains(subject,'{subject_escaped}')&"
+            f"$select=id,subject,organizer,start,end,responseStatus&"
+            f"$top=10"
+        )
+
+        response = await fetch_with_aiohttp(url, headers)
+        if not response:
+            return None
+        events = response.get("value", [])
+
+        if events:
+            # If organizer email provided, try to match
+            if organizer_email:
+                for event in events:
+                    org_email = (
+                        event.get("organizer", {})
+                        .get("emailAddress", {})
+                        .get("address", "")
+                    )
+                    if organizer_email.lower() in org_email.lower():
+                        return event
+
+            # Return first match
+            return events[0]
+
+        return None
+
+    except Exception as e:
+        logger.error(f"Error finding event by subject: {e}")
+        return None
+
+
+async def respond_to_calendar_invite(event_id: str, response: str) -> Tuple[bool, str]:
+    """Respond to a calendar invite.
+
+    Args:
+        event_id: Microsoft Graph event ID
+        response: Response type - 'accept', 'tentativelyAccept', or 'decline'
+
+    Returns:
+        Tuple of (success, message)
+    """
+    try:
+        from src.services.microsoft_graph.auth import get_access_token
+        from src.services.microsoft_graph.calendar import respond_to_invite
+
+        scopes = ["https://graph.microsoft.com/Calendars.ReadWrite"]
+        _, headers = get_access_token(scopes)
+
+        success = await respond_to_invite(headers, event_id, response)
+
+        if success:
+            response_text = {
+                "accept": "accepted",
+                "tentativelyAccept": "tentatively accepted",
+                "decline": "declined",
+            }.get(response, response)
+            return True, f"Successfully {response_text} the meeting"
+        else:
+            return False, "Failed to respond to the meeting invite"
+
+    except Exception as e:
+        logger.error(f"Error responding to invite: {e}")
+        return False, f"Error: {str(e)}"
+
+
+def action_accept_invite(app):
+    """Accept the current calendar invite."""
+    _respond_to_current_invite(app, "accept")
+
+
+def action_decline_invite(app):
+    """Decline the current calendar invite."""
+    _respond_to_current_invite(app, "decline")
+
+
+def action_tentative_invite(app):
+    """Tentatively accept the current calendar invite."""
+    _respond_to_current_invite(app, "tentativelyAccept")
+
+
+def _respond_to_current_invite(app, response: str):
+    """Helper to respond to the current message's calendar invite."""
+    current_message_id = app.current_message_id
+    if not current_message_id:
+        app.notify("No message selected", severity="warning")
+        return
+
+    # Get message metadata
+    metadata = app.message_store.get_metadata(current_message_id)
+    if not metadata:
+        app.notify("Could not load message metadata", severity="error")
+        return
+
+    subject = metadata.get("subject", "")
+    from_addr = metadata.get("from", {}).get("addr", "")
+
+    if not subject:
+        app.notify(
+            "No subject found - cannot match to calendar event", severity="warning"
+        )
+        return
+
+    # Run the async response in a worker
+    app.run_worker(
+        _async_respond_to_invite(app, subject, from_addr, response),
+        exclusive=True,
+        name="respond_invite",
+    )
+
+
+async def _async_respond_to_invite(
+    app, subject: str, organizer_email: str, response: str
+):
+    """Async worker to find and respond to calendar invite."""
+    # First, find the event
+    app.call_from_thread(app.notify, f"Searching for calendar event: {subject[:40]}...")
+
+    event = await find_event_by_subject(subject, organizer_email)
+
+    if not event:
+        app.call_from_thread(
+            app.notify,
+            f"Could not find calendar event matching: {subject[:40]}",
+            severity="warning",
+        )
+        return
+
+    event_id = event.get("id")
+    if not event_id:
+        app.call_from_thread(
+            app.notify,
+            "Could not get event ID from calendar",
+            severity="error",
+        )
+        return
+
+    current_response = event.get("responseStatus", {}).get("response", "")
+
+    # Check if already responded
+    if current_response == "accepted" and response == "accept":
+        app.call_from_thread(
+            app.notify, "Already accepted this invite", severity="information"
+        )
+        return
+    elif current_response == "declined" and response == "decline":
+        app.call_from_thread(
+            app.notify, "Already declined this invite", severity="information"
+        )
+        return
+
+    # Respond to the invite
+    success, message = await respond_to_calendar_invite(event_id, response)
+
+    severity = "information" if success else "error"
+    app.call_from_thread(app.notify, message, severity=severity)
diff --git a/src/mail/app.py b/src/mail/app.py
index 017cf64..cadee47 100644
--- a/src/mail/app.py
+++ b/src/mail/app.py
@@ -8,6 +8,11 @@ from .screens.SearchPanel import SearchPanel
 from .actions.task import action_create_task
 from .actions.open import action_open
 from .actions.delete import delete_current
+from .actions.calendar_invite import (
+    action_accept_invite,
+    action_decline_invite,
+    action_tentative_invite,
+)
 from src.services.taskwarrior import client as taskwarrior_client
 from src.services.himalaya import client as himalaya_client
 from src.utils.shared_config import get_theme_name
@@ -134,6 +139,9 @@ class EmailViewerApp(App):
             Binding("escape", "clear_selection", "Clear selection"),
             Binding("/", "search", "Search"),
             Binding("u", "toggle_read", "Toggle read/unread"),
+            Binding("A", "accept_invite", "Accept invite"),
+            Binding("D", "decline_invite", "Decline invite"),
+            Binding("T", "tentative_invite", "Tentative"),
         ]
     )
 
@@ -854,6 +862,18 @@ class EmailViewerApp(App):
     def action_create_task(self) -> None:
         action_create_task(self)
 
+    def action_accept_invite(self) -> None:
+        """Accept the calendar invite from the current email."""
+        action_accept_invite(self)
+
+    def action_decline_invite(self) -> None:
+        """Decline the calendar invite from the current email."""
+        action_decline_invite(self)
+
+    def action_tentative_invite(self) -> None:
+        """Tentatively accept the calendar invite from the current email."""
+        action_tentative_invite(self)
+
     def action_open_links(self) -> None:
         """Open the link panel showing links from the current message."""
         content_container = self.query_one(ContentContainer)