Derek McGrath is a Canadian actor.
He is known for his roles in Cheers as "Andy-Andy" Schroeder, Dr. Benjamin Jeffcoate in My Secret Identity, Crewman Chell in Star Trek: Voyager, and as Dr. Derek Hebert in Doc. McGrath also played Buck the dog in a fantasy sequence in a second season episode of Married... with Children and a mutant in the 1993 comedy film Freaked. He most recently appeared in a recurring role as the character of Anglican priest Duncan Magee in the CBC Television sitcom Little Mosque on the Prairie seasons 1-3; in season 4, he appears to have been written out and replaced with a younger priest played by actor Brandon Firla. He voices Spiff in the animated children's series Iggy Arbuckle. He also voices Melvin, the mayor of Maple Lake in the animated series Bob & Doug. He also provided the voice of Heathcliff's arch nemesis Spike in DIC's Heathcliff and the Catillac Cats. He has also voiced various characters in Grossology, Pole Position, The Romance of Betty Boop, Intergalactic Thanksgiving, Popeye and Son, Foofur, The Pink Panther and Sons, The Smurfs, Challenge of the GoBots, The Jetsons, Rambo, Muppet Babies, Turbo Teen, Superman, Dragon's Lair, The New Yogi Bear Show, The 13 Ghosts of Scooby-Doo, Lazer Tag Academy, Bakugan Battle Brawlers, Super Why!, Wayside, Ruby Gloom, Toot and Puddle, Spliced, Jane and the Dragon and Take Me Up to the Ball Game. In 2002, he narrated the National Film Board of Canada short The Hungry Squid, which won the Genie Award for Best Animated Short. In the 1970s, he was a prominent actor on TVOntario educational programming, most notably Mathmakers.