David or Dave Callahan, Callaghan, or O'Callaghan may refer to:
- David Callahan, founding editor of Inside Philanthropy, a digital media site
- David Callahan (Home and Away), fictional character in the Australian soap opera
- Dave Callaghan (born 1965), South African cricketer
- Dave O'Callaghan (born 1990), Irish rugby union player
- David O'Callaghan (dual player) (born 1983), Irish hurler and former Gaelic footballer for Dublin
- David O'Callaghan (Kerry Gaelic footballer) (born 1987)
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