| Thomas M. Hannigan | |
| State Assembly1: | California |
| District1: | 4th |
| Term Start1: | December 4, 1978 |
| Term End1: | November 30, 1992 |
| Predecessor1: | Vic Fazio |
| Successor1: | David Knowles |
| State Assembly2: | California |
| District2: | 8th |
| Term Start2: | December 7, 1992 |
| Term End2: | November 30, 1996 |
| Predecessor2: | Bev Hansen |
| Successor2: | Helen Thomson |
| Office3: | Director of the California Department of Water Resources |
| Term Start3: | March 1, 1999 |
| Term End3: | June 1, 2003 |
| Predecessor3: | David N. Kennedy |
| Successor3: | Michael J. Spear |
| Birth Date: | 30 May 1940 |
| Birth Place: | Vallejo, California, U.S. |
| Death Place: | Fairfield, California, U.S. |
| Party: | Democratic |
| Education: | Santa Clara University |
| Children: | 3 |
| Allegiance: |  United States |
| Battles: | Vietnam War |
| Rank: | Captain |
| Serviceyears: | 1963-1966 |
Thomas M. Hannigan (May 30, 1940 - October 9, 2018) was an American businessman and politician.
Hannigan was born in Vallejo, California. He served in the United States Marine Corps from 1963 to 1966 and was commissioned a captain. In 1962, he graduated from Santa Clara University. He moved to Fairfield, California and was in the real estate business. He served on the Fairfield City Council rom 1970 to 1974 and as mayor of Fairfield from 1972 to 1974. Hannigan also served on the Solano County Board of Supervisors from 1974 to 1978 and served as chair of the board of supervisors. Hannigan served in the California State Assembly from December 4, 1978 - November 30, 1996 and was a Democrat. From 1999 to 2003, Hannigan served as the director of the California Department of Water Resources.[1] [2]
The Fairfield–Vacaville station is named in his honor.[3] [4]
Hannigan's daughter, Erin Hannigan Andrews, is the Supervisor of Solano County.[5]