| Election Name: | 1873 New Jersey Senate elections |
| Seats Before1: | 13 |
| Party2: | Democratic Party (United States) |
| Seats Before2: | 8 |
| Seat Change1: | 1 |
| 1Data2: | 3 |
| Seat Change2: | 1 |
| 2Data2: | 2 |
| Senate President | |
| Before Election: | John W. Taylor |
| Before Party: | Republican Party (United States) |
| After Election: | John W. Taylor |
| 1Data1: | 3 |
| 2Data1: | 4 |
| Seats2: | 7 |
| Seats1: | 14 |
| Election Date: | November 1873 |
| Country: | New Jersey |
| Previous Election: | 1872 New Jersey State Senate election |
| Previous Year: | 1872 |
| Next Election: | 1874 New Jersey State Senate election |
| Next Year: | 1874 |
| Majority Seats: | 11 |
| Seats For Election: | 6 of the 21 seats in the New Jersey State Senate |
| Type: | legislative |
| 1Blank: | Seats up |
| 2Blank: | Races won |
| Party1: | Republican Party (United States) |
| Ongoing: | no |
| After Party: | Republican Party (United States) |
The 1873 New Jersey State Senate elections were held in November.
The elections took place during the final year of Governor Joel Parker's second non-consecutive term in office. Republicans gained the Hunterdon County seat.
| County | Incumbent[1] | Party | Elected Senator | Party | |||
|---|---|---|---|---|---|---|---|
| Atlantic | William Moore | Rep | No election | ||||
| Bergen | Cornelius Lydecker | Dem | No election | ||||
| Burlington | Henry J. Irick[2] | Rep | Barton F. Thorn | Rep | |||
| Camden | W. J. Sewell | Rep | No election | ||||
| Cape May | Thomas Beesley Sr. | Rep | Richard S. Leaming | Rep | |||
| Cumberland | Caleb Henry Sheppard | Rep | No election | ||||
| Essex | John W. Taylor | Rep | No election | ||||
| Gloucester | Samuel Hopkins | Rep | No election | ||||
| Hudson | John R. McPherson | Dem | No election | ||||
| Hunterdon | David H. Banghart | Dem | Frederic A. Potts | Rep | |||
| Mercer | Charles Hewitt | Rep | No election | ||||
| Middlesex | Levi D. Jarrard | Rep | Levi D. Jarrard | Rep | |||
| Monmouth | William H. Hendrickson | Dem | No election | ||||
| Morris | Augustus W. Cutler | Dem | No election | ||||
| Ocean | John G. W. Havens | Rep | No election | ||||
| Passaic | Henry A. Williams | Dem | John Hopper | Dem | |||
| Salem | Isaac Newkirk | Rep | No election | ||||
| Somerset | Elisha B. Wood | Rep | No election | ||||
| Sussex | Richard E. Edsall | Dem | Samuel T. Smith | Dem | |||
| Union | J. Henry Stone | Rep | No election | ||||
| Warren | Joseph B. Cornish | Dem | No election | ||||