Tiago Vagaroso da Costa Monteiro (pronounced [tiˈagu mõˈtɐiɾu]; born 24 July 1976 in Porto, Portugal) is a racing driver who drove for Jordan, Midland and Spyker MF1 Racing Formula One teams -- all progressive iterations of the same team as it was bought up by new owners -- during a two year stint as part of the Formula 1 circus. In the first year of his Formula One career (2005) he set a new record for the most finishes by a driver in a season (18), and also achieved a podium position (3rd place) at the highly controversial United States Grand Prix.

Tiago currently races with the SEAT Sport team in the World Touring Car Championship.