Robert Michael Emerson (born July 30, 1981) is an American professional mixed martial artist (MMA) fighter. He currently fights in the UFC's lightweight division.

On episode 3 of The Ultimate Fighter 5, Emerson faced eventual winner of the show, Nathan Diaz. In the second round of an exciting and back and forth fight Diaz managed to secure a rear naked choke for the win. However, B.J. Penn told the viewers that he could not take anything away from Emerson, as he had given the fight his all.

After Gabe Ruediger was taken off the show for his inability to make the 155 lb. weight limit Dana White brought back Emerson. Corey Hill, Ruediger's initial opponent, picked him to fight. The first round belonged to Hill as Emerson had problems getting inside on his lanky foe and dealing with his substantial reach advantage. In the second, the veteran got closer though and was able to potshot Hill and get out of range effectively, and he even locked in a heel hook late in the round when the action hit the mat, earning him the round and forcing the bout to a third and deciding stanza.

In the third, both fighters spent most of their time circling each other, and while Emerson appeared to score the most effective blows of the round with kicks to the leg, the decision went to the more aggressive Hill, who put Team Pulver back in the win column and in control heading into episode seven.