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Melinda Heather Cohn (born May 20, 1966) is an American actress, voice actress and comedian. She starred as Natalie Green in the sitcom The Facts of Life from 1979 to 1988, and is known for voicing Velma Dinkley in the Scooby-Doo franchise from 2002 to 2015, succeeding B. J. Ward, before being succeeded herself by Kate Micucci. Cohn appeared on VH1's List of "100 Greatest Kid Stars".
| Year | Title | Role | Notes |
| 1979–88 | The Facts of Life | Natalie Green, Frenchie | Main cast (201 episodes) |
| 1980–81 | Diff'rent Strokes | Natalie Green | Episodes: "The Slumber Party", "The Older Man" |
| 1982 | The Facts of Life Goes to Paris | TV film | |
| 1985 | Double Trouble | Janie Blakemore | Episode: "Funny Girl" |
| 1986 | The Boy Who Could Fly | Geneva Goodman | Feature film |
| 1987 | The Facts of Life Down Under | Natalie Green | TV film |
| 1987–88 | 21 Jump Street | Rosa Banducci | Episodes: "Christmas in Saigon", "Chapel of Love" |
| 1988 | Charles in Charge | Bunny Lembeck | Episode: "Bottle Baby" |
| 1991 | Dream On | Marie | Episode: "Toby or Not Toby" |
| 1993–94 | The Second Half | Maureen Tucker | Main cast (13 episodes) |
| 1999 | Suddenly Susan | Cindy | Episode: "Revenge of the Gophers" |
| The Chimp Channel | Candy Yuponce (voice) | Main cast (13 episodes) | |
| 2001 | Alone with a Stranger | Toni | Feature film |
| Virtually Casey | Joanne Collins | TV film | |
| The Facts of Life Reunion | Natalie Green | TV film | |
| 2002 | Under the Gun | Gale | Feature film |
| 2003 | One on One | Ms. Sorel | Episode: "Daddy, I Don't Need an Edumacation" |
| Swing | Martha | Feature film | |
| 2004 | The Help | Maggie, the Cook | Main cast (7 episodes) |
| 2005 | The Adventures of Tango McNorton: Licensed Hero | Lunch Lady | Short film |
| The Third Wish | Bridgette | Feature film | |
| 2007 | Sex and Death 101 | Trixie | Feature film |
| 2010 | Violet Tendencies | Violet | Feature film |
| 2011 | Hot in Cleveland | Cassie | Episode: "Love Thy Neighbor" |
| 2012 | The Secret Life of the American Teenager | Dylan's Mom | Recurring role (8 episodes) |
| 2013 | Holiday Road Trip | Artie | TV film |
| 2014 | The Middle | Kimberly | Episode: "The Wonderful World of Hecks" |
| Operation Marriage | Kathy | Short film | |
| Bones | Valentina | Episode: "The Puzzler in the Pit" | |
| FreakMe | April | TV pilot episode (unaired) | |
| 2015 | You're Killing Me | Karen | Feature film |
| 2016 | Worst Cooks in America | Herself (contestant) | Worst Cooks in America 9 (8 episodes) |
| A Cinderella Christmas | Zelda | TV film | |
| 2017 | Hollywood Dirt | Thelma | Feature film |
| 2018 | Fly | Air Traffic Controller Camille Fields | Recurring role (8 episodes) |
| Long Island Medium | Herself | ||
| 2019 | You Light Up My Christmas | Rose | TV movie features surviving original cast of The Facts of Life.Not a "The Facts of Life" Christmas movie. |
| 2020 | A Nice Girl Like You | Priscilla Blum | Feature film |
| 2021 | Live in Front of a Studio Audience | Herself | Episode: "The Facts of Life and Diff'rent Strokes" |
| 2024 | Palm Royale | Ann | 2 seasons, recurring role |
| Mother Father Sister Brother Frank | Joy Jennings | Feature film | |
| 2025 | Hearts Around the Table Jenna's First Love | Angie |
| Year | Title | Voice role | Notes |
| 1999–2001 | The Kids from Room 402 | Nancy Francis | TV series (34 episodes) |
| 2002–2006 | What's New, Scooby-Doo? | Velma Dinkley | TV series (41 episodes) |
| 2003 | Dexter's Laboratory | Librarian | Episode: "Voice Over/Blonde Leading the Blonde/Comic Stripper" |
| Kim Possible | Ms. Whisp | Episode: "Naked Genius" | |
| 2004 | Scooby-Doo! and the Loch Ness Monster | Velma Dinkley | Direct-to-video film |
| 2005 | Aloha, Scooby-Doo! | Direct-to-video film | |
| Scooby-Doo! in Where's My Mummy? | Direct-to-video film | ||
| 2006 | Scooby-Doo! Pirates Ahoy! | Direct-to-video film | |
| Family Guy | Natalie Green | Episode: "Prick Up Your Ears" | |
| Shaggy & Scooby-Doo Get a Clue! | Velma Dinkley | Episodes: "Shags to Riches" and "Almost Ghosts" [citation needed] | |
| 2007 | Chill Out, Scooby-Doo! | Direct-to-video film | |
| 2008 | Scooby-Doo! and the Goblin King | Direct-to-video film | |
| 2009 | Scooby-Doo! and the Samurai Sword | Direct-to-video film | |
| 2010 | Scooby-Doo! Abracadabra-Doo | Direct-to-video film | |
| 2010–13 | Scooby-Doo! Mystery Incorporated | TV series (52 episodes) | |
| 2010 | Scooby-Doo! Camp Scare | Direct-to-video film | |
| 2011 | Batman: The Brave and the Bold | Velma Dinkley / Ticket Girl | Episode: "Bat-Mite Presents: Batman's Strangest Cases!" |
| Scooby-Doo! Legend of the Phantosaur | Velma Dinkley | Direct-to-video film | |
| 2012 | Scooby-Doo! Music of the Vampire | Direct-to-video film | |
| Scooby-Doo! Spooky Games | Direct-to-video short | ||
| Big Top Scooby-Doo! | Direct-to-video film | ||
| Scooby-Doo! Haunted Holidays | Direct-to-video short | ||
| 2013 | Scooby-Doo! Mask of the Blue Falcon | Direct-to-video film | |
| Scooby-Doo! Stage Fright | Direct-to-video film | ||
| Scooby-Doo! and the Spooky Scarecrow | Direct-to-video short | ||
| Scooby-Doo! Mecha Mutt Menace | Direct-to-video short | ||
| 2014 | Scooby-Doo! WrestleMania Mystery | Direct-to-video film | |
| Scooby-Doo! Ghastly Goals | Direct-to-video short | ||
| Scooby-Doo! Frankencreepy | Direct-to-video film | ||
| 2015 | Scooby-Doo! Moon Monster Madness | Direct-to-video film | |
| Scooby-Doo! and the Beach Beastie | Direct-to-video short | ||
| Scooby-Doo! and Kiss: Rock and Roll Mystery | Direct-to-video film | ||
| 2022–23 | Around the Sun | Aunt Nora / Molly | Audio drama (3 episodes) |
| Year | Title | Role | Notes |
| 2002 | Scooby-Doo! The Glowing Bug Man | Velma Dinkley | Voice role |
| 2003 | Scooby-Doo! The Scary Stone Dragon | Voice role | |
| 2003 | Scooby-Doo! Mystery Mayhem | Voice role | |
| 2005 | Scooby-Doo! Unmasked | Voice role | |
| 2006 | Scooby-Doo! Who's Watching Who? | Voice role | |
| 2006 | Scooby-Doo! Frights Camera Mystery | Voice role | |
| 2009 | Scooby-Doo! First Frights | Voice role | |
| 2010 | Scooby-Doo! and the Spooky Swamp | Voice role | |
| 2014 | Scooby-Doo and Looney Tunes Cartoon Universe: Adventure | Voice role | |
| 2015 | Lego Dimensions | Voice role |
| Preceded byB. J. Ward | Voice of Velma Dinkley 2002–2015, 2017 [citation needed] | Succeeded byStephanie D'Abruzzo[citation needed] |