The San Antonio River is a major waterway in Texas, United States.

San Antonio River may also refer to:

• San Antonio River (California), in Monterey County, California, United States
• San Antonio River (Mexico)
• San Antonio River (South America), forming part of the border between Argentina and Brazil
• San Antonio River (Peru), in Rodríguez de Mendoza Province

• Operation PLUTO
• Operation Plymouth Rock
• Operation Polarfuchs
• Operation polo
• Operation Pomegranate
• Operation Pommegranate
• Operation Power Geyser
• Operation Prague
• Operation Praying Mantis
• Operation Predator
• Operation Preying Mantis
• Operation Prime Chance
• Operation Provide Comfort
• Operation Provide Relief
• Operation PUSH
• Operation Quicksilver
• Operation Quicksilver (1978)
• Operation Quicksilver (1990s)
• Operation Quicksilver (deception plan)
• Operation: QUICKSILVER (WWII)
• Operation RAFTER
• Operation Rainbow
• Operation Ranchhand
• Operation Ranch Hand
• Operation Ranger