Galusha Aaron Grow (August 31, 1823 – March 31, 1907) was an American politician, lawyer, writer and businessman, who served as 24th Speaker of the U.S. House of Representatives from 1861 to 1863. Elected as a Democrat in the 1850 congressional elections, he switched to the newly organized Republican Party in the mid-1850s when the Democratic Party tried to force the extension of slavery into western territories.