| Birth Name: | Simon Long Downey |
| Birth Date: | 4 June 1877 |
| Birth Place: | Downsville, Maryland, U.S. |
| Death Place: | Downsville, Maryland, U.S. |
| Office1: | Member of the Maryland House of Delegates from Washington County |
| Term Start1: | January 1947 |
| Term End1: | October 24, 1950 |
| Successor1: | Jacob B. Berkson |
| Term Start2: | January 1927 |
| Term End2: | January 1931 |
| Party: | Republican |
| Children: | 5, including Charles |
Simon Long Downey (June 4, 1877 – October 24, 1950) was an American farmer and politician who served two non-consecutive terms in the Maryland House of Delegates.[1]