| Walter J. Sullivan | |
| Birth Name: | Walter Joseph Sullivan |
| Office: | Mayor of Cambridge, Massachusetts |
| Term Start: | 1968 |
| Term End: | 1969 |
| Predecessor: | Daniel Hayes |
| Successor: | Alfred Vellucci |
| Term Start1: | 1974 |
| Term End1: | 1975 |
| Predecessor1: | Barbara Ackermann |
| Successor1: | Alfred Vellucci |
| Term Start2: | 1986 |
| Term End2: | 1987 |
| Predecessor2: | Francis Duehay |
| Successor2: | Alfred Vellucci |
| Birth Date: | 2 March 1923 |
| Birth Place: | Cambridge, Massachusetts, United States |
| Death Place: | Cambridge, Massachusetts, United States |
| Occupation: | Politician |
| Party: | Democratic |
| Spouse: | Marion Colarusso (m. 1946) |
Walter Joseph Sullivan (March 2, 1923 - August 4, 2014) was an American politician. Sullivan was the 52nd, 55th, and 62nd Mayor of Cambridge, Massachusetts.
Born in Cambridge, Sullivan attended the Cambridge Rindge and Latin School, and took on work at the M.A. Sullivan Trucking Company. He served in the United States Army Air Forces during World War II.
In 1951, Sullivan served in the Massachusetts House of Representatives as a Democrat. In 1960, he served on the Cambridge City Council. Sullivan served three terms as Mayor of Cambridge from 1968-1969, 1974-1975, and 1986-1987. The City of Cambridge named their water treatment facility after him.[1] Sullivan died in his hometown in 2014.[2]