Athletics at the 2010 South American Games – Women's 400 metres

The Women's 400m event at the 2010 South American Games was held on March 20 at 18:30.

Results
Results were published.

Final
†: Alison Sánchez from 🇧🇴 was initially 7th in 56.60, but was disqualified, because she was tested positive for nandrolone.