Day 2 of the 2012 Olympic swimming competition includes:
- Women's 100m Butterfly - Finals
- Dana Vollmer wins gold medal with world record time.
- Men's 100m Breastroke - Finals
- Cameron van der Burgh wins gold medal with world record time.
- Women's 400m Freestyle - Finals
- Muffat of France wins gold with American Schmitt right behind. Rebecca Adlington wins bronze for Great Britain.
- Men's 4x100m Freestyle - Finals
- Team USA takes the silver in the 4x100m free relay. Lochte loses the lead in the final 100m and France gets the gold.