Senator Underwood may refer to:
Jim Underwood (politician) (1946–2013), Guam Senate Joseph R. Underwood (1791–1876), U.S. Senator from Kentucky Levi Underwood (1821–1902), Vermont State Senate Nerissa Bretania Underwood (born 1955), Guam Senate Oscar Underwood (1862–1929), U.S. Senator from Alabama Thomas R. Underwood (1898–1956), U.S. Senator from Kentucky Warner Underwood (1808–1872), Kentucky State Senate