American Dad!
Season 6: There Will Be Bad Blood (IMDb; Thanksgiving Specials Wiki; Wikia)
American Dreams
Season 1: The End of the Innocence (IMDb; Thanksgiving Specials Wiki)
Season 3: What Dreams May Come (IMDb; Thanksgiving Specials Wiki)
American Housewife
Season 1: The Blow-Up (IMDb; Wikia)
Season 2: Family Secrets (IMDb; Thanksgiving Speicals Wiki; Wikia)
Aqua Teen Hunger Force
Season 2: The Dressing (IMDb; Wikia)
Axe Cop
Season 1: 28 Days Before (IMDb) Most of the ep is set on Halloween, but it's definitely a Thanksgiving ep.
Ben and Kate
Season 1: Reunion (IMDb)
The Big Bang Theory
Season 7: The Thanksgiving Decoupling (IMDb; Wikia)
Season 9: The Platonic Permutation (IMDb; Wikia)
Black-ish
Season 3: Auntsgiving (IMDb; Wikia)
Bless the Harts
Season 1: Mega-Lo Memories (IMDb; TV Tropes; Wikia)
Bob's Burgers
Season 3: An Indecent Thanksgiving Proposal (IMDb; TV Tropes; Wikia; Wikipedia)
Season 4: Turkey in a Can (IMDb; TV Tropes; Wikia; Wikipedia)
Season 5: Dawn of the Peck (IMDb; TV Tropes; Wikia; Wikipedia)
Season 6: Gayle Makin' Bob Sled (IMDb; TV Tropes; Wikia; Wikipedia)
Season 7: The Quirkducers (IMDb; TV Tropes; Wikia; Wikipedia)
Season 8: Thanks-hoarding (IMDb; TV Tropes; Wikia)
Season 9: I Bob Your Pardon (IMDb; TV Tropes; Wikia)
Season 10: Now We're Not Cooking with Gas (IMDb; TV Tropes; Wikia)
Season 11: Diarrhea of a Poopy Kid (IMDb; TV Tropes; Wikia)
Season 12: Stuck in the Kitchen with You (IMDb; TV Tropes; Wikia)
Season 13: Putts-giving (IMDb; TV Tropes; Wikia)
Brooklyn Nine-Nine
Season 1: Thanksgiving (IMDb; TV Tropes; Wikia)
Season 2: Lockdown (IMDb; TV Tropes; Wikia)
Season 3: Ava (IMDb; TV Tropes; Wikia)
Season 4: Mr. Santiago (IMDb; TV Tropes; Wikia)
Season 5: Two Turkeys (IMDb; TV Tropes; Wikia)
Buffy the Vampire Slayer
Season 4: Pangs (IMDb; TV Tropes; Wikia; Wikipedia)
Cheers
Season 5: Thanksgiving Orphans (IMDb; Wikia)
The Cleveland Show
Season 1: A Brown Thanksgiving (IMDb; Thanksgiving Specials Wiki; TV Tropes; Wikia; Wikipedia)
Season 4: A General Thanksgiving Episode (IMDb; Wikia)
Season 4 (yes, two eps from the same season): Turkey Pot Die (IMDb; Wikia)
Community
Season 4: Cooperative Escapism in Familial Relations (IMDb; TV Tropes; Wikia; Wikipedia)
The Cosby Show
Season 6: Cliff's Wet Adventure (IMDb; Thanksgiving Specials Wiki)
Dan Vs.
Season 2: The Family Thanksgiving (Amazon; Hulu; Wikia)
Dharma & Greg
Season 1: The First Thanksgiving (IMDb; Wikia)
Don't Trust the B in Apt. 23
Season 2: It's a Miracle (Amazon; A.V. Club; IMDb)
Everybody Loves Raymond (There are more Thanksgiving eps than the ones mentioned here, but I don't really remember them.)
Season 1: Turkey or Fish (Amazon; IMDb; Wikia)
Season 3: No Fat (Amazon; IMDb; Wikia)
Season 5: Fighting In-Laws (Amazon; IMDb)
Season 8: The Bird (Amazon; IMDb)
Family Guy
Season 13: Turkey Guys (Amazon; IMDb; OHS Wiki; Wikia; Wikipedia) There was at least one other Thanksgiving ep before, but this is the only one I recall seeing.
Fresh off the Boat
Season 2: Huangsgiving (Amazon; A.V. Club; IMDb; OHS Wiki; Wikia)
Season 3: No Thanks-giving (Amazon; IMDb; Wikia)
Season 4: The Day After Thanksgiving (Amazon; IMDb; Wikia)
The Fresh Prince of Bel-Air
Season 1: Talking Turkey (Amazon; IMDb; Wikia)
Friends (There were Thanksgiving eps all 10 seasons, but these are the only ones I remember even a little)
Season 3: The One with the Football (Amazon; IMDb; Wikia)
Season 5: The One with All the Thanksgivings (Amazon; IMDb; Wikia; Wikipedia)