Allen Joseph Ellender (September 24, 1890 – July 27, 1972) was a U.S. senator from Houma in Terrebonne Parish in south Louisiana, who served from 1937 until 1972 when he died in office in Maryland at the age of eighty-one. He was a Democrat who was originally allied with Huey Pierce Long, Jr.. As senator, he compiled a generally conservative record, voting 77 percent of the time with the Conservative Coalition on domestic issues.