Robert or Bob Callahan may refer to:
- Bob Callahan (politician) (1937–2020), Canadian politician
- Bob Callahan (American football) (1923–2011), American football player
- Robert J. Callahan (1930–2013), Connecticut Supreme Court justice
See also
edit- Robert O'Callaghan (disambiguation)
- Robert Callaghan, a fictional character in the 2016 animated film Big Hero 6