Gahagan

Gahagan may refer to:

• Dennis Gahagan (c. 1817-), early settler in San Diego, California
• Helen Gahagan (1900 – 1980), American actress and politician
• James Gahagan (1927 - 1999), American abstract expressionist painter
• John Gahagan (born 1958), Scottish former footballer who played as a left winger
• Gahagan Mounds Site, a Caddoan Mississippian culture mound site in Red River Parish, Louisiana.