| Carl Hanniwell | |
| Office1: | MPP for Niagara Falls |
| Term Start1: | 1945 |
| Term End1: | 1948 |
| Predecessor1: | Cyril Overall |
| Successor1: | William Houck |
| Office2: | Mayor of Niagara Falls |
| Term Start2: | 1938 |
| Term End2: | 1939 |
| Predecessor2: | Charles Anderson |
| Successor2: | George Inglis |
| Birth Name: | Carl David Hanniwell |
| Birth Date: | 28 May 1903 |
| Birth Place: | St. David's, Ontario, Canada |
| Death Place: | Niagara Falls, Ontario, Canada |
| Party: | Progressive Conservative |
| Profession: | Politician |
Carl David Hanniwell (May 28, 1903 – April 22, 1969) was a Canadian politician who served as a member of the Ontario legislature and as a municipal politician.[1] [2]
He served as an alderman and later as mayor of Niagara Falls. He was mayor from 1938 until 1939. He was elected to the 22nd Legislative Assembly of Ontario in 1945, serving from June 4, 1945, until April 27, 1948.[3] [4] Later, he was vice-chairman of Ontario Hydro.