Antonio da Costa Santos (Toninho) was a Brazilian architect and politician affiliated to the Workers' Party (PT).

He took office as Mayor of Campinas on January 1, 2001, and was shot to death on the night of September 10, 2001, as he was driving home alone from a shopping mall. His murder, which stunned the country, was still unsolved as of 2004.

He was succeeded in office by the vice-Mayor, Izalene Tiene.