Mark Feuerstein (born June 8, 1971) is an American actor.

Feuerstein got his break-through on television as a recurring character on the daytime soap opera Loving (1983). When director Nancy Meyers was casting What Women Want, her daughter recognized Feuerstein from Practical Magic (1998) and insisted that her mother cast him. He was dubbed by wags as "Murderer of a thousand sitcoms" and "sitcom kryptonite" due to his lack of success in Fired Up (1997), Conrad Bloom (1998), The Heart Department (2001), Good Morning, Miami (2002) and, 3 Lbs. (2007). Feuerstein reunited as a love interest with Practical Magic co-star Sandra Bullock in the film Two Weeks Notice, but all of his scenes were deleted. Feuerstein was named one of People magazine's 50 Most Beautiful People in 2003.

Feuerstein is currently starring in the lead role of a new USA Network show titled Royal Pains.