| Birth Date: | 8 May 1929 |
| State Senate: | California |
| District: | 29th |
| Term: | December 4, 2000 – November 30, 2008 |
| Preceded: | Dick Mountjoy |
| Succeeded: | Bob Huff |
| State Assembly2: | California |
| District2: | 59th |
| Term2: | June 7, 1995 – November 30, 2000 |
| Preceded2: | Dick Mountjoy |
| Succeeded2: | Dennis Mountjoy |
| Party: | Republican |
| Children: | 7 |
Robert G. Margett (born May 8, 1929) is an American retired politician who was a California state senator until 2008. He represented the 29th Senate District,[1] which includes parts of Los Angeles, Orange and San Bernardino counties. He is a Republican and served on the Budget and Fiscal Review Committee, Government Organization Committee, Natural Resources and Water Committee, Public Safety Committee and Transportation and Housing Committee.
Formerly a mayor in Arcadia, California, he was first elected to the State Senate in 2000 and was re-elected to represent the 29th Senate District in November 2004. Previously he sat in the State Assembly, representing the 59th District, from 1995 to 2000.