| Election Name: | 1957 New Jersey Senate elections |
| Seats1: | 13 |
| Country: | New Jersey |
| Previous Election: | 1955 New Jersey State Senate election |
| Previous Year: | 1955 |
| Next Election: | 1959 New Jersey State Senate election |
| Next Year: | 1959 |
| Majority Seats: | 11 |
| Election Date: | November 5, 1957 |
| Seats For Election: | 10 of the 21 seats in the New Jersey State Senate |
| 1Blank: | Seats up |
| 2Blank: | Races won |
| Party1: | Republican Party (United States) |
| Ongoing: | no |
| Type: | legislative |
| Seats2: | 8 |
| Seat Change2: | 1 |
| 2Data1: | 7 |
| Party2: | Democratic Party (United States) |
| Seats Before2: | 7 |
| Seat Change1: | 1 |
| Seats Before1: | 14 |
| 1Data2: | 3 |
| 2Data2: | 4 |
| Senate President | |
| Before Party: | Republican Party (United States) |
| 1Data1: | 6 |
| After Party: | Republican Party (United States) |
The 1957 New Jersey State Senate elections were held on November 5.
The elections coincided with the re-election of Governor Robert Meyner. Ten of New Jersey's 21 counties elected Senators. Democrats gained one seat in Passaic County, where Anthony J. Grossi unseated incumbent Republican Frank W. Shershin.
| County | Incumbent | Party | Elected Senator | Party | |||
|---|---|---|---|---|---|---|---|
| Atlantic | Frank S. Farley | Rep | Frank S. Farley | Rep | |||
| Bergen | Walter H. Jones | Rep | Walter H. Jones | Rep | |||
| Burlington | Albert McCay | Rep | No election | ||||
| Camden | Joseph W. Cowgill | Dem | No election | ||||
| Cape May | Charles W. Sandman | Rep | No election | ||||
| Cumberland | W. Howard Sharp | Dem | W. Howard Sharp | Dem | |||
| Essex | Donal C. Fox | Dem | No election | ||||
| Gloucester | Harold W. Hannold | Rep | No election | ||||
| Hudson | James F. Murray Jr. | Dem | William F. Kelly Jr. | Dem | |||
| Hunterdon | Wesley Lance | Rep | Wesley Lance | Rep | |||
| Mercer | Sido Ridolfi | Dem | Sido Ridolfi | Dem | |||
| Middlesex | John A. Lynch | Dem | No election | ||||
| Monmouth | Richard R. Stout | Rep | No election | ||||
| Morris | Thomas J. Hillery | Rep | Thomas J. Hillery | Rep | |||
| Ocean | W. Steelman Mathis | Rep | W. Steelman Mathis | Rep | |||
| Passaic | Frank W. Shershin | Rep | Anthony J. Grossi | Dem | |||
| Salem | John A. Waddington | Dem | No election | ||||
| Somerset | Malcolm Forbes | Rep | No election | ||||
| Sussex | George B. Harper | Rep | George B. Harper | Rep | |||
| Union | Kenneth Hand | Rep | No election | ||||
| Warren | Wayne Dumont | Rep | No election | ||||
Seats where the margin of victory was under 10%:
Seats where the margin of victory was 10% or greater; and the seat flipped party control: