Kelly Michael Armstrong is an American lawyer and politician serving as the U.S. representative for North Dakota's at-large congressional district since 2019. A member of the Republican Party, he served as the North Dakota state senator from the 36th district from 2012 to 2018 and chair of the North Dakota Republican Party from 2015 until 2018. On January 23, 2024, he announced he would not seek re-election in 2024, instead opting to run in the 2024 North Dakota gubernatorial election.

North Dakota's at-large congressional district is the sole congressional district for the state of North Dakota. Based on size, it is the eighth largest congressional district in the nation.