As an expert in productivity tools with years of experience helping users streamline their digital lives, I've guided countless iOS users through Google Calendar syncing issues. Sharing calendars is a game-changer for families, teams, and personal organization—letting you stay in sync effortlessly.
Yet, if someone shares a Google Calendar with you and you're on an iPhone, iPad, or other iOS device, it often won't appear in the native Calendar app. Simply checking boxes or re-adding your Google account won't fix it.
Don't worry—there's a straightforward solution backed by Google's own sync settings.

This process isn't intuitive, but follow these proven steps, and your shared calendars will sync reliably:
Note: Changes may take a few minutes to propagate to your device.
Now, exit the browser, open the Calendar app, and tap Calendars at the bottom. Your selected shared calendars should now appear—toggle them on as needed.
For more tips, check out 8 Google Calendar Tricks You Need to Learn Before Christmas or 7 Google Calendar Tips for Better Office Time Management.