| Thomas McCormack | |
| Birth Date: | 21 February 1873 |
| Birth Place: | New Brunswick, Canada |
| State Senate: | California |
| District: | 15th |
| Term: | January 2, 1933 – January 3, 1949 |
| Preceded: | Arthur H. Breed Sr. |
| Succeeded: | Luther E. Gibson |
| State Senate1: | California |
| District1: | 5th |
| Term1: | January 7, 1929 – January 2, 1933 |
| Preceded1: | Benjamin F. Rush |
| Succeeded1: | John B. McColl |
| Party: | Republican |
Thomas McCormack (February 21, 1873 – August 17, 1949) was a lawmaker from California who served in the California State Senate for the 5th district from 1929 to 1933 and the 15th district from 1933 to 1949.[1] He was born in Canada.[2]