Systems, methods, and machine-readable media to provide notification of calendar events across multiple platforms of potentially diverse types. In one embodiment, a method of cross-platform calendar notification can comprise detecting an occurrence of a previously set calendar event. Profile information for a user associated with the calendar event can be read and one or more end devices to which to provide notification of the occurrence of the calendar event can be determined based on the profile information. A notification message can be generated indicating occurrence of the calendar event. The notification message can be sent to each of the one or more end devices.