Show 
Actor (44 credits)
Actor (44 credits)
2020
Westworld
(TV Series)
Liam Dempsey
Liam Dempsey
- Genre
(2020)
... Liam Dempsey
- The Mother of Exiles
(2020)
... Liam Dempsey
- The Winter Line
(2020)
... Liam Dempsey (credit only)
- Parce Domine
(2020)
... Liam Dempsey
2019
Gaslight
(Podcast Series)
Ben
Ben
- Chapter X
(2019)
... Ben (voice)
- Chapter IX
(2019)
... Ben (voice)
- Chapter VIII
(2019)
... Ben (voice)
- Chapter VII
(2019)
... Ben (voice)
- Chapter VI
(2019)
... Ben (voice)
- Chapter V
(2019)
... Ben (voice)
- Chapter IV
(2019)
... Ben (voice)
- Chapter III
(2019)
... Ben (voice)
- Chapter II
(2019)
... Ben (voice)
- Chapter I
(2019)
... Ben (voice)
2019
Modern Love
(TV Series)
Rob
Rob
- The Race Grows Sweeter Near Its Final Lap
(2019)
... Rob
- At the Hospital, an Interlude of Clarity
(2019)
... Rob
2012-2014
The Newsroom
(TV Series)
Jim Harper
Jim Harper
- What Kind of Day Has It Been
(2014)
... Jim Harper
- Oh Shenandoah
(2014)
... Jim Harper
- Contempt
(2014)
... Jim Harper
- Main Justice
(2014)
... Jim Harper
- Run
(2014)
... Jim Harper
- Boston
(2014)
... Jim Harper
- Election Night: Part II
(2013)
... Jim Harper
- Election Night: Part I
(2013)
... Jim Harper
- Red Team III
(2013)
... Jim Harper
- One Step Too Many
(2013)
... Jim Harper
- News Night with Will McAvoy
(2013)
... Jim Harper
- Unintended Consequences
(2013)
... Jim Harper
- Willie Pete
(2013)
... Jim Harper
- The Genoa Tip
(2013)
... Jim Harper
- First Thing We Do, Let's Kill All the Lawyers
(2013)
... Jim Harper
- The Greater Fool
(2012)
... Jim Harper
- The Blackout, Part 2: Mock Debate
(2012)
... Jim Harper
- The Blackout, Part 1: Tragedy Porn
(2012)
... Jim Harper
- 5/1
(2012)
... Jim Harper
- Bullies
(2012)
... Jim Harper
- Amen
(2012)
... Jim Harper
- I'll Try to Fix You
(2012)
... Jim Harper
- The 112th Congress
(2012)
... Jim Harper
- News Night 2.0
(2012)
... Jim Harper
- We Just Decided To
(2012)
... Jim Harper
2014
Olive Kitteridge
(TV Mini Series)
Christopher Kitteridge
Christopher Kitteridge
- Security
(2014)
... Christopher Kitteridge
- A Different Road
(2014)
... Christopher Kitteridge
- Incoming Tide
(2014)
... Christopher Kitteridge
2010
Late Show with David Letterman
(TV Series)
Johnny
Johnny
- Gwyneth Paltrow/American Idiot
(2010)
... Johnny (uncredited)
2008
The Battery's Down
(TV Series)
John Gallagher Jr.,
John Gallagher Jr.,
- The Bronx Is Up
(2008)
... John Gallagher Jr.,
2006
Love Monkey
(TV Series)
Paul
Paul
- Mything Persons
(2006)
... Paul (as John Gallagher)
- Pilot
(2006)
... Paul (as John Gallagher)
2003
NYPD Blue
(TV Series)
Ray Spier
Ray Spier
- Andy Appleseed
(2003)
... Ray Spier
- Keeping Abreast
(2003)
... Ray Spier
2002
The West Wing
(TV Series)
Tyler
Tyler
- 20 Hours in America: Part II
(2002)
... Tyler
- 20 Hours in America: Part I
(2002)
... Tyler
2002
Law & Order
(TV Series)
Terrence Holt
Terrence Holt
- Girl Most Likely
(2002)
... Terrence Holt (as John Gallagher)
Show
Producer (1 credit)
Producer (1 credit)
Show
Soundtrack (5 credits)
Soundtrack (5 credits)
2012
The Newsroom
(TV Series) (performer - 1 episode)
- 5/1
(2012)
... (performer: "Sunshine" - uncredited)
2010
The 64th Annual Tony Awards
(TV Special) (performer: "Boulevard of Broken Dreams", "American Idiot")
2010
Late Show with David Letterman
(TV Series) (performer - 1 episode)
- Gwyneth Paltrow/American Idiot
(2010)
... (performer: "Holiday" - uncredited)
Show
Thanks (1 credit)
Thanks (1 credit)
Show
Self (24 credits)
Self (24 credits)
2023
That One Audition
(Podcast Series)
Self
Self
- John Gallagher Jr: The Gifts of Theatre Training
(2023)
... Self
2016-2022
Made in Hollywood
(TV Series)
Self
Self
- Gone in the Night/Anything's Possible
(2022)
... Self
- Lightyear/The Offer/Abandoned
(2022)
... Self
- Come Play/Tremors: Shrieker Island/The True Adventures of Wolfboy
(2020)
... Self
2020-2022
Hollywood First Look
(TV Series)
Self
Self
- Episode #4.48
(2022)
... Self
- Episode #2.30
(2020)
... Self
- Episode #2.1
(2020)
... Self
2017
The George Lucas Talk Show: Stage Show
(TV Series)
Self
Self
- Episode XXXXIV: July Is True From A Certain POV
(2017)
... Self
2016
Who Wants to Be a Millionaire
(TV Series)
Self - Plus One
Self - Plus One
- Movie Week 4
(2016)
... Self - Plus One (as Johnny Gallagher)
2012
Big Morning Buzz Live
(TV Series)
Self
Self
- Monica & Shannon Brown/John Gallagher, Jr./Sixpence None the Richer
(2012)
... Self
2008-2009
The Battery's Down
(TV Series)
Self
Self
- Bad Bad News
(2009)
... Self
- Paciencia y Fe
(2009)
... Self
- Sorry - Grateful
(2008)
... Self
