AS-19

AS-19 may refer to:


 * AS-19 (drug), a drug used to improve long-term memory
 * Kh-80, a Soviet cruise missile known to NATO as the AS-19 Koala
 * USS Proteus (AS-19), a United States Navy submarine tender in commission from 1944 to 1947, 1960 to 1992, and 1994 to 1999