Deas or DEAS may refer to:
- Deas (surname), a Scottish surname originating in Fife
- Deas Island, a river island in British Columbia, Canada
- Deas Vail, an American rock band
- Harvard School of Engineering and Applied Sciences formerly known as Division of Engineering and Applied Sciences
- Department of East Asian Studies at the University of Cambridge
- Department of East Asian Studies at the University of Delhi
In Scottish Gaelic, the word deas or deise means ready, right hand, south, dexterous or trim.