Editing David Gallagher (section)

===Television===
{|class="wikitable sortable"
|-
! Year
! Title
! Role
! class="unsortable"|Notes
|-
|1995
|''[[It Was Him or Us]]''
|Stevie Pomeroy
|rowspan=2|Television film
|-
|1996
|''[[Summer of Fear (1996 film)|Summer of Fear]]''
|Zack Marshall
|-
|1996–2006
|''[[7th Heaven (TV series)|7th Heaven]]''
|Simon Camden
|Main role; seasons 1-7 & 10, recurring; seasons 8 & 9 
|-
|rowspan=2|1997
|''[[Angels in the Endzone]]''
|Kevin Harper
|Television film
|-
|''[[Walker, Texas Ranger]]''
|Chad Morgan
|Episode: "Brainchild"
|-
|1999–2002
|''[[Rocket Power]]''
|Oliver Van Rossum (voice)
|10 episodes
|-
|1999
|''[[The Wild Thornberrys]]''
|Ben (voice)
|2 episodes<ref name="btva2">{{cite web |title=David Gallagher (visual voices guide) |url=http://www.behindthevoiceactors.com/David-Gallagher/ |access-date=July 14, 2021 |publisher=Behind The Voice Actors}} A green check mark indicates that a role has been confirmed using a screenshot (or collage of screenshots) of a title's list of voice actors and their respective characters found in its credits or other reliable sources of information.</ref>
|-
|2000
|''[[The New Adventures of Spin and Marty: Suspect Behavior]]''
|Marty Markham
|Television film
|-
|2006–2009
|''[[Numbers (TV series)|Numb3rs]]''
|Buck Winters
|3 episodes
|-
|2007
|''[[CSI: Miami]]''
|Rick Bates
|Episode: "Dangerous Son"
|-
|rowspan=3|2008
|''[[Saving Grace (American TV series)|Saving Grace]]''
|Paul Shapiro
|Episode: "A Survivor Lives Here"
|-
|''[[Bones (TV series)|Bones]]''
|Ryan Stephenson
|Episode: "The He in the She"
|-
|''[[Without a Trace]]''
|Jeff Ellis
|Episode: "Push Comes to Shove"
|-
|2009
|''[[Smallville]]''
|[[Wonder Twins|Zan]]
|Episode: "Idol"
|-
|2010
|''[[The Deep End (2010 TV series)|The Deep End]]''
|Kevin Mather
|Episode: "An Innocent Man"
|-
|2011
|''[[The Vampire Diaries]]''
|Ray Sutton
|2 episodes
|-
|rowspan=3|2012
|''[[Criminal Minds]]''
|Matt Moore
|Episode: "The Wheels on the Bus"
|-
|''[[CSI: Crime Scene Investigation]]''
|Adam Kemp
|Episode: "Tressed To Kill"
|-
|''[[CSI: NY]]''
|Marty Bosch
|Episode: "Clean Sweep"
|-
|2013
|''[[Second Generation Wayans]]''
|Jeremy Silverman
|
|-
|2014
|''[[In Your Eyes (2014 film)|In Your Eyes]]''
|Lyle Soames
|rowspan=2|Television film
|-
|2017
|''Born and Missing''
|Brian
|-
|2020
|''[[S.W.A.T. (2017 TV series)|S.W.A.T.]]''
|Sawyer
|Episode: "Bad Cop"
|}