Carroll William Sembera (July 26, 1941 – June 15, 2005) was an American professional baseball relief pitcher, who played in Major League Baseball (MLB) for the Houston Astros (1965–67) and Montreal Expos (1969–70).

In a five-season career, Sembera posted a 3–11 record with a 4.70 ERA and six saves in 99 games pitched.

Sembera made his MLB debut with the Houston Astros in 1965 at the age of 23.

Sembera earned the first save in Expos history on opening day in 1969[1] Following his career as a player, Sembera scouted for the Major League Scouting Bureau and with the Seattle Mariners for eleven years.

This biographical article relating to an American baseball pitcher born in the 1940s is a stub.