ICA may refer to any of the following:
1. Short for Independent Computing Architecture, ICA is a thin protocol developed by Citrix for separating screen updates and user input processing from the rest of the application's logic. This protocol enables for remote accessibility with less bandwidth consumption as only the screen updates, mouse movements, and keyboards are sent over the session.
2. Short for Integrated Communications Adapter, ICA is an adapter used with the IBM 9370 series and 4300 series mainframes that eliminate the need for a separate communications controller.