"Inside the Beltway" is an American idiom used to characterize matters that are, or seem to be, important primarily to officials of the U.S. federal government, to its contractors and lobbyists, and to the media personnel who cover them – as opposed to the interests and priorities of the general U.S. population.

The Beltway refers to Interstate 495, the Capital Beltway, a circumferential highway (beltway) that has encircled Washington, D.C. (the capital of the United States) since 1964. Some speakers of American English now employ the word as a metonym for federal government insiders (cf. Beltway bandits), and the phrase "inside the Beltway" is used as a title for a number of political columns and news items by publications like the Washington Times, American University's magazine, and columnist John McCaslin.

Geographically, Inside the Beltway describes Washington, D.C. and those sections of Maryland and Virginia that lie within the perimeter of the Capital Beltway.