| Leon Johnson Ladner | |
| Birth Date: | 29 November 1884 |
| Birth Place: | Ladner, British Columbia, Canada |
| Death Place: | Vancouver, British Columbia, Canada |
| Spouse: | Jeanne Lantzius |
| Riding: | Vancouver South |
| Predecessor: | Richard Clive Cooper |
| Successor: | Angus MacInnis |
| Term Start: | 1921 |
| Term End: | 1930 |
| Profession: | lawyer |
| Party: | Conservative |
Leon Johnson Ladner (November 29, 1884 - April 12, 1978) was a Canadian lawyer and Conservative politician who represented Vancouver South in the House of Commons of Canada from 1921 to 1930.