Almer Stillwell "Mike" Monroney was an American politician who served as a United States senator from Oklahoma from 1951 to 1969, and previously as the United States representative for Oklahoma's 5th congressional district from 1939 until 1951. A member of the Democratic Party, Monroney was the last Democrat to hold Oklahoma’s Class 3 Senate seat.

Oklahoma's 5th congressional district is a congressional district in the U.S. state of Oklahoma. It borders all of the other congressional districts in the state except the 1st district. It is densely populated and covers most of Oklahoma County and all of Lincoln, Pottawatomie and Seminole counties, as well as parts of Canadian and Logan counties. With a Cook Partisan Voting Index rating of R+12, it is the least Republican district in Oklahoma, a state with an all-Republican congressional delegation.