Bob Wiacek (born January 7, 1953)[1][3] is an American comic book artist and writer, working primarily as an inker.

Wiacek has inked over such pencilers as Carmine Infantino on Star Wars, Paul Smith and John Romita Jr. on The Uncanny X-Men, June Brigman on Power Pack, John Byrne on Alpha Flight and Sensational She-Hulk, Walter Simonson on X-Factor and Orion, and George Pérez on Brave and the Bold, volume 2.

He has also worked with creators such as Bob Budiansky, Colleen Doran, Ron Garney, Mike Grell, Michael Netzer (Nasser), Kevin Nowlan, Don Perlin, Bill Sienkiewicz, Todd McFarlane, and Barry Windsor-Smith.

Wiacek's first regular title was on Man-Thing issues #1-11, from 1979 to 1981, where he inked over Jim Mooney's pencils and then provided finished art based on Don Perlin's breakdowns.

From 1990 to 1992, Wiacek embarked on his longest stretch as an inker, working with John Romita Jr. and then Bob Layton on Iron Man issues #258–283.