Joseph William Martin Jr., American publisher and politician, 49th Speaker of the United States House of Representatives (died 1968)

Joseph William Martin Jr. was an American Republican politician who served as the 44th speaker of the United States House of Representatives from 1947 to 1949 and 1953 to 1955. He represented a House district centered on his hometown of North Attleborough, Massachusetts, from 1925 to 1967 and was the leader of House Republicans from 1939 until 1959, when he was ousted from leadership after the party's disastrous losses in the 1958 elections. He was the only Republican to serve as Speaker in a sixty-four year period from 1931 to 1995. He was a "compassionate conservative" who opposed the New Deal and supported the conservative coalition of Republicans and southern Democrats.

The speaker of the United States House of Representatives, commonly known as the speaker of the House or House speaker, is the presiding officer of the United States House of Representatives, the lower chamber of the United States Congress. The office was established in 1789 by Article I, Section II, of the U.S. Constitution. By custom and House rules, the speaker is the political and parliamentary leader of the House and is simultaneously its presiding officer, de facto leader of the body's majority party, and the institution's administrative head. Speakers also perform various other administrative and procedural functions. Given these many roles and responsibilities, the speaker usually does not personally preside over debates—that duty is instead delegated to members of the House from the majority party—nor regularly participate in floor debates.