El Hadj Amadou Dia Bâ OLY[1] (born September 22, 1958) is a retired Senegalese athlete who competed in the 400 metres hurdles.

He won the 1988 Olympic silver medal in this event with a personal best time of 47.23 seconds.

He competed in three consecutive Summer Olympics for his native country, starting in 1984.

As of 20 November 2024, Dia Ba holds five track records for the 400 metres hurdles set over the period August 1985 to September 1989.

These include the track records for Manresa (48.69) and Nairobi (48.03).