| Election Name: | 1821 United States Senate election in New York |
| Type: | presidential |
| Ongoing: | no |
| Previous Election: | 1815 United States Senate election in New York |
| Previous Year: | 1815 |
| Next Election: | 1827 United States Senate election in New York |
| Next Year: | 1827 |
| Election Date: | February 6, 1821 |
| Votes For Election: | Majority vote of legislature needed to win |
| 1Blank: | Senate |
| 2Blank: | Percentage |
| 3Blank: | House |
| 4Blank: | Percentage |
| Image1: | File:Francis Alexander - Martin Van Buren - Google Art Project closeupcrop.jpg |
| Nominee1: | Martin Van Buren |
| Party1: | Democratic-Republican Party (United States) |
| Alliance1: | Bucktails |
| 1Data1: | 17 |
| 2Data1: | 68% |
| 3Data1: | 69 |
| 4Data1: | 57.02% |
| Nominee2: | Nathan Sanford |
| Party2: | Democratic-Republican Party (United States) |
| Alliance2: | DeWitt Clinton |
| 1Data2: | 8 |
| 2Data2: | 32% |
| 3Data2: | 52 |
| 4Data2: | 42.98% |
| Senator | |
| Before Election: | Nathan Sanford |
| Before Party: | Democratic-Republican Party (United States) |
| After Election: | Martin Van Buren |
| After Party: | Democratic-Republican Party (United States) |
The 1821 United States Senate election in New York was held on February 6, 1821, by the New York State Legislature to elect a U.S. Senator (Class 1) to represent the State of New York in the United States Senate.
Nathan Sanford had been elected in 1815 to this seat, and his term would expire on March 3, 1821.
Although nominally in the same party, the Democratic-Republicans were split into two fiercely opposing factions: the "Clintonians" (allies of Governor DeWitt Clinton), and "Bucktails" (a combine of the Tammany members from New York City and Clinton's upstate adversaries led by Martin Van Buren). The Federalist Party had disbanded, the larger part joining the Clintonians, the others the Bucktails. At the State election in April 1820, although Clinton was re-elected Governor, a Bucktails majority was elected to the assembly, and five of the eight state senators up for renewal were Bucktails. The 44th New York State Legislature met from November 7 to 20, 1820; and from January 9 to April 3, 1821, at Albany, New York. The party strength in the assembly as shown by the vote for Speaker was: 69 for Bucktail Peter Sharpe and 52 for Clintonian John C. Spencer.
Before the election, a caucus of Democratic-Republican State legislators was held with 82 members present. 58 voted for Van Buren, 24 for Sanford, and Martin Van Buren was declared nominated. In the election, he received the votes of the Bucktails.
Disregarding the caucus nominee, a practice now already established, the incumbent U.S. Senator Nathan Sanford received the votes of the Clintonians.
Martin Van Buren was the choice of both the Assembly and the Senate, and was declared elected.
| Office | House | Dem.-Rep./Bucktails | Dem.-Rep./Clintonian | ||
|---|---|---|---|---|---|
| U.S. Senator | State Senate (32 members) | Martin Van Buren | 17 | Nathan Sanford | 8 |
| State Assembly (126 members) | Martin Van Buren | 69 | Nathan Sanford | 52 | |