| Election Name: | 1956 United States Senate election in Oklahoma |
| Country: | Oklahoma |
| Flag Year: | 1941 |
| Type: | presidential |
| Ongoing: | no |
| Previous Election: | 1950 United States Senate election in Oklahoma |
| Previous Year: | 1950 |
| Next Election: | 1962 United States Senate election in Oklahoma |
| Next Year: | 1962 |
| Election Date: | November 6, 1956 |
| Image1: | File:Mike Monroney.jpg |
| Nominee1: | Mike Monroney |
| Party1: | Democratic Party (United States) |
| Popular Vote1: | 459,996 |
| Percentage1: | 55.35% |
| Nominee2: | Douglas McKeever |
| Party2: | Republican Party (United States) |
| Popular Vote2: | 371,146 |
| Percentage2: | 44.65% |
| Map Size: | 300px |
| U.S. Senator | |
| Before Election: | Mike Monroney |
| Before Party: | Democratic Party (United States) |
| After Election: | Mike Monroney |
| After Party: | Democratic Party (United States) |
The 1956 United States Senate election in Oklahoma took place on November 6, 1956. Incumbent Democratic Senator Mike Monroney ran for re-election to a second term. He avoided a contentious Democratic primary when Lieutenant Governor Cowboy Pink Williams declined to challenge him and easily won renomination. In the general election, he faced Republican state party chairman Douglas McKeever. Even though President Dwight D. Eisenhower was winning the state handily, Monroney won re-election by a wide margin.