Robert H. Strahan (September 22, 1843 Newburgh, Orange County, New York – October 1, 1884) was an American lawyer and politician from New York.
He was the son of James S. Strahan (1804–1877) and Emelia Clark Strahan (1807–1880). He learned the printing trade, and graduated from Westminster College in New Wilmington, Pennsylvania in 1863.
He enlisted as a private and was detailed for service as a clerk in the U.S. Department of War. In 1864, he joined his regiment and fought during the Overland Campaign, but soon came down with typhoid pneumonia and was sent back to Washington, D.C. to recover. He remained as a clerk in the War Department for the remainder of the war and afterwards.
He studied law at The Columbian College, D.C., graduated in 1868, was admitted to the bar in 1869, and practiced in Newburgh. He married Amelia S. McDowell (1844–1877), and their only child was George V. Strahan (1871–1923).
He was a member of the New York State Assembly (Orange Co., 1st D.) in 1871 and 1872. Afterwards he removed to New York City, and practiced law there.
He was again a member of the State Assembly (New York Co., 13th D.) in 1876, 1877 and 1879; and a member of the New York State Senate (8th D.) in 1880 and 1881.
On January 24, 1883, he married Caroline Cuyler Candee, and they had one child.
He died on October 1, 1884, at his home at 422 West Seventy-First Street, in New York City, of Bright's disease, and was buried at the Cedar Hill Cemetery in Newburgh.