- India
- Inside Jokes
- International Space Station
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- Jack McBrayer
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- Jana Bogg's father
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- Janine Davis
- Janitor's wife
- Japanese
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- Jason Davies
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- Jeff Difford
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- Jeffrey
- Jenga
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- Jennifer Glickman
- Jenny Runyon
- Jeremy Howe
- Jerry
- Jerry O'Connell
- Jess (Season 11)
- Jesse
- Jesse Heiman
- Jessica Ambrosetti
- Jessica Walter
- Jet Propulsion Laboratory
- Jill
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- Jimmy Speckerman
- Jiu-Jitsu, Bubble Wrap, and Yoo-hoo
- Joann
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- Jodi Lyn O'Keefe
- Joe Manganiello
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- John Ross Bowie
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- Johnson
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- Josh Brener
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- Joy
- Joyce Kim
- Judd Hirsch
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- Judy Greer
- Julia Pace Mitchell
- June
- June Squibb
- Justice League
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- KGMQ TV
- KMGQ
- Kaley Cuoco
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- Karen
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- Katey Sagal
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- Katie
- Katie Leclerc
- Keith
- Keith Carradine
- Ken
- Kenneth
- Kenneth Fitzgerald
- Kevin Brief
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- Killer Asteroids, Oklahoma, and a Frizzy Hair Machine
- Kim-Ly Nguyen
- Kim-Ly and Mai Nguyen
- Kimberly
- King Kong Comics
- Kip Thorne
- Klingon
- Klingon Boggle
- Koothrappali
- Koothrappali1
- Kripke Krippler
- Kristy Cecil
- Kunal Nayyar
- Kurt
- La Puerta Roja Cantina
- Lakshmi Choudry
- Lalita Gupta
- Lance Barber
- Lance Reddick
- Large Hadron Collider
- Larry Fowler
- Larson
- Las Vegas Wedding Chapel Minister
- Latin
- Laura Spencer
- Lauren Lapkus
- Laurie Metcalf
- Lawrence
- LeVar Burton
- Le Nguyen
- Lee Aronsohn
- Legalese and a Whole Hoo-Ha
- Leon Delgado
- Leonard's Bedroom
- Leonard's Brother-in-law (Sister's Husband)
- Leonard's Cousins
- Leonard's Grandfather
- Leonard's Grandmother
- Leonard's Murder Mystery Novel
- Leonard's Sister
- Leonard's Song
- Leonard Cooper
- Leonard Hofstadter
- Leonard Hofstadter's Birthday Party
- Leonard Hofstadter/Gallery
- Leonard Hofstadter/Gallery - Female Friends
- Leonard Hofstadter/Gallery - Groups
- Leonard Hofstadter/Gallery - Himself
- Leonard Hofstadter/Gallery - Male Friends
- Leonard Hofstadter/Gallery - Penny
- Leonard Hofstadter/Gallery - Sheldon
- Leonard Nimoy
- Leonard and Penny
- Leonard and Penny's Child
- Leonard and Penny's Relationship Agreement
- Leonard and Penny's Wedding
- Leonard and Penny's Wedding II
- Leonard and Priya
- Leonard and Stephanie
- Leonid Meteor Shower
- Leslie's Brother-in-law (Sister's Husband)
- Leslie's Sister
- Leslie (Young Sheldon)
- Leslie Gance
- Leslie Winkle
- Leslie Winkle/Gallery
- Libby
- Linda Hagemeyer
- Linda Pemberton
- Linda Swanson
- Lio Tipton
- Lisa
- Lisa's Husband
- Lisa (roommate)
- List of Awards
- List of The Big Bang Theory Home Media
- List of The Big Bang Theory characters
- List of The Big Bang Theory episodes
- List of The Big Bang Theory specials
- List of Young Sheldon characters
- List of Young Sheldon episodes
- List of books visible on shelves
- List of minor characters
- List of popular culture references
- Little Green Men and a Fella's Marriage Proposal
- Little House on the Prairie
- Lockhart
- London Cheshire
- Lone Star Train Museum
- Lonely Larry
- Long Horn Drugs
- Loop hole
- Lorraine (Season 3)
- Lorraine (Season 4)
- Los Angeles Angels
- Louie
- Louis Leakey
- Lovey-Dovey
- Lucas
- Lucky
- Lucky's Place
- Lucy
- Lucy's Boyfriend
- Lullabies Baby Emporium
- Lulu's Corner Cafe
- Lyle (Season 5)
- Lyndon
- Lynette
- M.O.N.T.E.
- Madame Laveau
- Madge
- Magazines
- Mai Nguyen
- Main Page
- Malcolm Green
- Mandarin
- Mandy Chow
- Marcus Larson
- Marcy Grossman
- Margo Harshman
- Maria Ferrari
- Mario
- Marissa Johnson
- Mark Cendrowski
- Mark Hamill
- Mark Harelik
- Marriage
- Married Couples
- Mars Rover
- Marta and Letty
- Martha
- Marty
- Marty (Young Sheldon)
- Marvel Comics
- Mary-Beverly War
- Mary Cooper
- Mary Cooper's grandmother
- Mary Grill
- Mary T. Quigley
- Massachusetts Institute of Technology
- Mathology
- Matt
- Matt Bennett
- Matt Hobby
- Max
- Mayim Bialik
- Mayor Harrison
- McCallister Auto and Tire
- McKenna Grace
- Meagen Fay
- Medford
- Medford Cards and Stationery
- Medford Casino
- Medford Community Hospital
- Medford High School
- Medford Lanes
- Medford Mart
- Medford Medals and Trophies
- Medford Middle School
- Medford Station
- Medford Wash
- Medical Professionals
- Meemaw
- Mei-Tung
- Melissa
- Melissa Peterman
- Melissa Rauch
- Melissa Tang
- Merchandise
- Mexico
- Michael Hofstadter
- Michael Hofstadter's Children
- Michael Hofstadter's Wife
- Michael Trucco
- Mighty Little Man
- Mikayla
- Mike
- Mike (Season 1)
- Mike Massimino
- Mike Rostenkowski
- Mildred
- Minor Characters Classified
- Minstrel
- Miscellaneous People
- Missy's Second Child
- Missy Cooper
- Missy Cooper's ex-husband
- Missy Cooper's son
- Mitch
- Mitch's Son and the Unconditional Approval of a Government Agency
- Mitchell
- Mitzy
- Mobile Virtual Presence Device
- Molly
- Molly Morgan
- Mona
- Money Laundering and a Cascade of Hormones
- Montana Jordan
- Moondance
- Moonpie
- Motoki Maxted
- Mr. Anderson
- Mr. Bloom
- Mr. Bustifer
- Mr. Cooper
- Mr. Gupta
- Mr. Jeffries
- Mr. Johnson
- Mr. Lockhart
- Mr. Stover
- Mr. Sweeney
- Mrs. Bloom
- Mrs. Cooper
- Mrs. Ebner
- Mrs. Fowler
- Mrs. Gunderson
- Mrs. Gupta
- Mrs. Jeffries
- Mrs. Johnson
- Mrs. Koothrappali
- Mrs. Krawcynski
- Mrs. Latham
- Mrs. Petrescu
- Mrs. Rostenkowski
- Mrs. Siebert
- Mrs. Veazey
- Mrs. Wolowitz II
- Mrs Howard
- Ms. Fenley
- Ms. Johnson
- Ms. McDonald
- Murray Wolowitz
- Mysteries
- Mystic Warlords of Ka'a
- NASA
- Nancy
- Nancy (The Big Bang Theory)
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