| Election Name: | 1938 United States Senate election in New York |
| Country: | New York |
| Flag Image: | Flag of New York (1909–2020).svg |
| Type: | presidential |
| Ongoing: | no |
| Previous Election: | 1932 United States Senate election in New York |
| Previous Year: | 1932 |
| Next Election: | 1944 United States Senate election in New York |
| Next Year: | 1944 |
| Election Date: | November 8, 1938 |
| Image1: | Robert F. Wagner.jpg |
| Nominee1: | Robert F. Wagner |
| Party1: | Democratic Party (US) |
| Alliance1: | American Labor Party |
| Popular Vote1: | 2,497,029 |
| Percentage1: | 54.48% |
| Nominee2: | John Lord O'Brian |
| Party2: | Republican Party (US) |
| Alliance2: | Independent Progressive |
| Popular Vote2: | 2,058,615 |
| Percentage2: | 44.92% |
| Map Size: | 270px |
| Senator | |
| Before Election: | Robert F. Wagner |
| Before Party: | Democratic Party (US) |
| After Election: | Robert F. Wagner |
| After Party: | Democratic Party (US) |
The United States Senate election of 1938 in New York was held on November 8, 1938. Incumbent Democratic Senator Robert F. Wagner was re-elected to a third term over Republican John Lord O'Brian.