|Occupation||Puppeteer, actress, voice actress|
|Spouse(s)||Michael K. Frith|
Kathryn Mullen is an American puppeteer, actress, and voice actress most closely associated with Jim Henson projects.
Mullen began performing on The Muppet Show in its third season, primarily as Gaffer the Backstage Cat. She also voice directed Dog City for Nelvana, worked as a designer for The Muppet Movie, right-handed for Frank Oz on Yoda on The Empire Strikes Back, and was one of the creators of Between the Lions. While reprising Gaffer for several Muppet movies, she also performed Mokey Fraggle and Cotterpin Doozer on Henson's Fraggle Rock. She performed the Gelfling Kira in the movie The Dark Crystal, Allegra on Allegra's Window, and Leona the Lion on Between the Lions.
Kathy Mullen, with her husband, former Muppet designer Michael K. Frith, founded "No Strings" along with emergency aid worker Johnie McGlade. The company originally created a film for children in Afghanistan, warning of the dangers of land mines. In the film, "The Story of the Little Carpet Boy," one puppet loses several limbs before he learns to avoid land mines completely. Since the first film, No Strings has gone on to create films for children in need in areas including Africa, Haiti, Madagascar, Sudan, and Syria. In 2016 No Strings was awarded the 2016 Adela Dwyer-St. Thomas of Villanova Peace Award from Villanova University 
In 2013, Kathryn Mullen attended Dragon Con with Karen Prell and Michael K. Frith as part of the 30th Anniversary of Fraggle Rock where Kathryn Mullen performed Mokey Fraggle while Karen Prell performed Red Fraggle.
- Allegra's Window – Allegra
- Between the Lions – Leona Lion (2000–2002)
- Fraggle Rock – Mokey Fraggle, Cotterpin Doozer, Rock Hockey Hanna, Merboo Merggle, Magenta Fraggle, Mother Goose, A Pink Dancing Fraggle, Old Gypsy Lady, Wimple Fraggle, Mama Tree Bird, Sally Spotless, Tammy Shrub, Additional Muppets
- Jim Henson's Little Muppet Monsters – Penguin, Rat
- Sesame Street – Grover's Mommy, Sally Smith, Additional Muppets
- The Muppet Show – Wanda (1979) Gaffer the Cat, Mrs. Appleby, Prairie Dog, Beaker Clones, Additional Muppets
- The Wubbulous World of Dr. Seuss – Little Cat A (1996–1997), Junior Kangaroo (1996–1997), Morton the Elephant Bird (1996–1997), Mayor Stovepipe, Lieutenant Hopwood, Mrs. Casaba, Additional Muppets
- A Muppet Family Christmas – Mokey Fraggle, Additional Muppets
- Billy Bunny's Animal Songs – Billy Bunny's Mother, Frog, Gopher
- John Denver and the Muppets: A Christmas Together – Additional Muppets
- Labyrinth – Goblins (puppeteer)
- Sesame Street Presents Follow That Bird – Grouch Diner Patron, Anything Muppet Girl
- The Christmas Toy – Apple
- The Dark Crystal – Kira (puppeteer)
- The Great Muppet Caper – Gaffer the Cat, Additional Muppets
- The Muppet Movie – Additional Muppets
- The Muppets Celebrate Jim Henson – Joy Buzzer, Mokey Fraggle, Additional Muppets
- The Muppets Go Hollywood – Additional Muppets
- The Muppets Go to the Movies – Additional Muppets
- The Muppets Take Manhattan – Jill the Frog, Additional Muppets
- "YODA'S RIGHT HAND! INTERVIEW WITH KATHY MULLEN". No Strings International. 5 December 2015. Retrieved 10 May 2017.
- Faulk, Karen (7 November 2012). magination Illustrated: The Jim Henson Journal. Chronicle Books. p. 142. ISBN 9781452105826. Retrieved 10 May 2017.
- Dark Crystal Event at the Museum of the Moving Image, Museum of the Moving Image, retrieved 10 May 2017
- Hall, Jane (2003-03-24). "No Strings on help, it's the Full Monty". Sunday Sun. Retrieved 2010-06-23.
- "2016 Adela Dwyer-St. Thomas of Villanova Peace Award to be Presented to Puppetry Group No Strings International". Villanova University.
| Performer of Wanda
| Performer of Mokey Fraggle