Gilmore Girls
Season 3: A Deep-Fried Korean Thanksgiving (Amazon; A.V. Club; IMDb; Wikia)
Season 6: He's Slippin' 'em Bread... Dig? (Amazon; IMDb; Wikia)
Glee
Season 4: Thanksgiving (Amazon; A.V. Club; IMDb; Wikia; Wikipedia)
Heroes
Season 4: Thanksgiving (Amazon; A.V. Club; IMDb; ; Wikipedia)
How I Met Your Mother
Season 1: Belly Full of Turkey (Amazon; IMDb; TV Tropes; Wikia; Wikipedia)
Season 3: Slapsgiving (Amazon; A.V. Club; IMDb; TV Tropes; Wikia; Wikipedia)
Season 5: Slapsgiving 2: Revenge of the Slap (Amazon; A.V. Club; IMDb; TV Tropes; Wikia; Wikipedia)
Season 6: Blitzgiving (Amazon; A.V. Club; IMDb; TV Tropes; Wikia; Wikipedia)
Season 7: The Rebound Girl (Amazon; A.V. Club; IMDb; TV Tropes; Wikia; Wikipedia)
Life Unexpected
Season 2: Thanks Ungiven (Amazon; IMDb; Wikia)
The Michael J. Fox Show
Season 1: Thanksgiving (Amazon; A.V. Club; IMDb)
The Middle
Season 4: Thanksgiving IV (Amazon; A.V. Club; IMDb; Wikia) There's a Thanksgiving ep every season, but I think this is the only one I've seen.
Modern Family
Season 3: Punkin Chunkin (Amazon; A.V. Club; IMDb; Wikia; Wikipedia)
Season 6: Three Turkeys (Amazon; A.V. Club; IMDb; Wikia; Wikipedia)
Season 8: Thanksgiving Jamboree (Amazon; A.V. Club; IMDb; Wikia; Wikipedia)
Season 9: Winner Winner Turkey Dinner (Amazon; A.V. Club; IMDb; Wikia)
Season 11: The Last Thanksgiving (Amazon; A.V. Club; IMDb; Wikia)
Murphy Brown
Season 4: Mission Control (IMDb; Wikia)
Season 11: Thanksgiving and Taking (Amazon; IMDb; Wikia)
My Adventures with Superman
Season 1: Hearts of the Fathers (IMDb; TV Tropes; Wikia)
The Neighbors
Season 1: Thanksgiving Is for the Bird-Kersees (Amazon; IMDb; Wikia)
Season 2: Thanksgiving is No Schmuck Bait (Amazon; IMDb; Wikia)
New Girl
Season 1: Thanksgiving (Amazon; A.V. Club; IMDb; Wikia)
Season 2: Parents (Amazon; A.V. Club; IMDb; Wikia)
Season 3: Thanksgiving III (Amazon; A.V. Club; IMDb; Wikia)
Season 4: Thanksgiving IV (Amazon; A.V. Club; IMDb; Wikia)
Season 6: Last Thanksgiving (Amazon; A.V. Club; IMDb; Wikia)
Northern Exposure
Season 4: Thanksgiving (IMDb; Wikia)
The O.C.
Season 1: The Homecoming (Amazon; IMDb; Wikia)
Season 4: The Cold Turkey (Amazon; IMDb; Wikia)
Parenthood
Season 2: Happy Thanksgiving (Amazon; A.V. Club; IMDb; NBC)
Picket Fences
Season 1: Thanksgiving (Amazon; IMDb)
The Real O'Neals
Season 2: The Real Tradition (Amazon; IMDb; Wikia)
Scream Queens
Season 1: Thanksgiving (Amazon; A.V. Club; IMDb; Wikia; Wikipedia)
The Simpsons
Season 2: Bart vs. Thanksgiving (Amazon; A.V. Club; IMDb; OHS Wiki; TV Tropes; Wikia; Wikipedia)
Single Parents
Season 2: Every Thursday Should Be Like This (Amazon; IMDb; Wikia)
Smallville
Season 10: Ambush (Amazon; IMDb; Wikia)
Son of Zorn
Season 1: The Battle of Thanksgiving (Amazon; A.V. Club; IMDb)
South Park (There are other Thanksgiving eps, but these are what I remember.)
1997 short: Jay Leno Thanksgiving Special (Wikia; YouTube)
Season 15: A History Channel Thanksgiving (Amazon; A.V. Club; Hulu; IMDb; Wikia; Wikipedia)
The Spectacular Spider-Man
Season 1: Nature vs. Nurture (Amazon; IMDb; MAU Wiki; TV Tropes)
Speechless
Season 1: T-h-a-- Thanksgiving (Amazon; IMDb; Wikia)
Season 2: B-r-i-- British I-n-v-- Invasion (Amazon; IMDb; Wikia)
Season 3: C-e-- Celebrity S-u-- Suite (Amazon; IMDb; Wikia)
Sports Night
Season 1: Thespis (Amazon; A.V. Club; IMDb; TV Tropes; Wikia)
Stumptown
Season 1: November Surprise (Amazon; IMDb; Wikia)
Suburgatory
Season 1: Thanksgiving (Amazon; A.V. Club; IMDb; Wikia)
Season 2: The Wishbone (Amazon; A.V. Club; IMDb; Wikia)
Sunnyside
Season 1: Too Many Lumpies (Amazon; IMDb; Wikia)
Supergirl
Season 1: Livewire (Amazon; A.V. Club; IMDb; TV Tropes; Wikia; Wikipedia)
The Unicorn
Season 1: Turkeys and Traditions (CBS; IMDb; Wikia)
WKRP in Cincinnati
Season 1: Turkeys Away (Amazon; IMDb)