| District: | 8th |
| Predecessor: | John Adams |
| Successor: | Zadock Pratt |
| State: | New York |
| Term: | March 4, 1835 – March 3, 1837 |
| Party: | Jacksonian |
| Birth Date: | 5 May 1776 |
| Birth Place: | Blenheim, Province of New York, British America |
| Death Place: | Blenheim, New York, U.S. |
| Occupation: | Farmer, politician |
Valentine Efner (May 5, 1776 – November 20, 1865) was a U.S. Representative from New York, serving one term in office from 1835 to 1837.
Born in Blenheim Hill, near Blenheim, New York, Efner completed preparatory studies and became a farmer. He served in local offices, including justice of the peace.
Efner was a major in the New York Militia during the War of 1812. He was later promoted to lieutenant colonel and second in command of the militia's 104th Regiment.
He served as member of the New York State Assembly in 1829.
Efner was elected as a Jacksonian to the Twenty-fourth Congress (March 4, 1835 – March 3, 1837).
He did not run for reelection in 1836 and returned to farming.
He died in Blenheim Hill on November 20, 1865, and was buried at Blenheim Hill Cemetery.