Theresa Elizabeth Polo is an American actress. She starred as Pamela Martha Focker in the Meet the Parents trilogy, Helen Santos in The West Wing, and played the role of police officer Stef Adams Foster in the Freeform series The Fosters (2013–2018) and its spinoff Good Trouble (2019–2024).

The Fosters is an American family drama television series created by Peter Paige and Bradley Bredeweg. It premiered in the United States on June 3, 2013, on the ABC Family television network and concluded on June 6, 2018. It followed the lives of the Adams-Foster family led by a lesbian couple, Stef Foster, a police officer, and Lena Adams, a school vice principal, who raise one biological son and four adopted teenagers in San Diego, California.