Samuel Emerson Opdycke (January 7, 1830 – April 25, 1884) was a businessman and Union Army brigadier general during the American Civil War.

Opdycke enlisted immediately following the First Battle of Bull Run and was commissioned a first lieutenant in the 41st Ohio Infantry on August 26, 1861.

In command of a demi-brigade, Opdycke's men were some of the first to reach the summit of Missionary Ridge during the Battles for Chattanooga.

Gen. George D. Wagner, ordered Opdycke and the other two brigade commanders to take up hasty defensive positions in front of the Union fortified line.

[3] Opdycke resigned from the army in 1866 and moved to New York City, where he engaged in the dry goods business.