William Stanley Zmitrowicz Jr. (born May 16, 1947), known professionally as Bill Smitrovich (/ˈsmɪtrəvɪtʃ/ SMIT-rə-vitch[1]), is an American actor.

Smitrovich was born on May 16, 1947, in Bridgeport, Connecticut, the son of Anna (née Wojna) and Stanley William Zmitrowicz, a tool and die maker.

Smitrovich was the lead guest star in the pilot film of the 1980s crime drama hit series Miami Vice.

He is known for his roles on the A&E series A Nero Wolfe Mystery (based on the Nero Wolfe detective stories by Rex Stout) as Inspector Cramer, and on the ABC series The Practice as Assistant District Attorney Kenneth Walsh and then went on to Without a Trace, where he played the recurring character of Chief Alex Olcyk.

His best-known appearances include the two-part Star Trek: Deep Space Nine third-season episode "Past Tense," 24, Numb3rs, NYPD Blue, Touched by an Angel, Law & Order: Special Victims Unit, Criminal Minds, Castle, and the Dynasty reboot.