| Chauncey Loomis | |
| Birth Date: | September 11, 1780 |
| Death Place: | Albany, New York |
| Resting Place: | Presbyterial Burial Ground Albany, New York |
| Office1: | New York State Senate |
| Term Start1: | 1814 |
| Term End1: | April 6, 1817 |
| Successor1: | Jediah Prendergast |
| Office2: | New York State Assembly |
| Term Start2: | 1810 |
| Term End2: | 1811 |
| Nationality: | American |
| Occupation: | Politician |
Chauncey Loomis (September 11, 1780 - April 6, 1817, Albany, New York) was an American politician from New York.
Loomis was a member of the New York State Assembly (Genesee Co.) in 1810 and 1811.
He was a member of the New York State Senate (Western D.) from 1814 until his death, sitting in the 38th, 39th and 40th New York State Legislatures. He died near the end of the session of the Legislature, and was buried at the Presbyterial Burial Ground in Albany.