Astute may refer to:
- HMS Astute (P447), launched 1945, Amphion-class submarine, scrapped 1970
- HMS Astute (S119), launched 2007, nuclear-powered attack submarine
- Astute class submarine, a class of which HMS Astute (S119) is the lead ship
- USS Astute (AM-148), US Navy minesweeper
- Operation Astute, an Australian military operation in response to the 2006 East Timor crisis