Ronne Troup (born June 10, 1945) is an American actress and educator whose acting roles include Pauline "Polly" Williams Douglas on the sitcom My Three Sons.

In 1964, Troup was working as a television background extra appearing (uncredited) in some fourth season black-and-white episodes of My Three Sons in classroom scenes featuring co-star Don Grady.

In December 1966 (at age 21), she was cast as Sister Bertrille and had begun filming the pilot for The Flying Nun when she was dropped after the studio's first choice Sally Field finally agreed to accept the role.

[citation needed] In 1968, she played the role of Leslie Hayden in Danger Island, the cliffhanger serial that was featured on the Banana Splits Adventure Hour children's program on Saturday mornings.

[4] On June 19, 2010, Troup appeared with her My Three Sons co-stars at a 50th anniversary celebration of the classic series at the Paley Center for Media in Beverly Hills.