Austin F. Pike (October 16, 1819 - October 8, 1886) was a United States Representative and Senator from New Hampshire. Born in Hebron, New Hampshire, he pursued an academic course, studied law, and was admitted to the bar of Merrimack County in 1845. He was a member of the New Hampshire House of Representatives from 1850 to 1852 and in 1865 - 1866, and served as speaker during the last two years. He was a member of the New Hampshire Senate in 1857 - 1858, serving as president the last year.
Pike was elected as a Republican to the Forty-third Congress (March 4, 1873-March 3, 1875) and was a unsuccessful candidate for reelection in 1874 to the Forty-fourth Congress. He was elected as a Republican to the U.S. Senate and served from March 4, 1883, until his death. While in the Senate, he was chairman of the Committee on Claims (Forty-eighth and Forty-ninth Congresses). He died in Franklin, New Hampshire; interment was in Franklin Cemetery.