Movies:
* The Princess Bride (1987) - Inigo Montoya (voice)
* The Pagemaster (1994) - Richard, the Pagemaster (voice)
* The Mask of Zorro (1998) - Diego Vega (voice)
* The Prince of Egypt (1998) - Aaron (voice)
* Tarzan (1999) - Clayton (voice)
* The Road to El Dorado (2000) - Tulio (voice)
* Shrek (2001) - Thelonious (voice)
* Shrek 2 (2004) - Thelonious (voice)
* Over the Hedge (2006) - RJ (voice)
* Shrek the Third (2007) - Thelonious (voice)
* Kung Fu Panda (2008) - Tai Lung (voice)
* Shrek Forever After (2010) - Thelonious (voice)
* Kung Fu Panda 2 (2011) - Tai Lung (voice)
* Kung Fu Panda 3 (2016) - Tai Lung (voice)
* The Croods (2013) - Grug (voice)
* The Croods: A New Age (2020) - Grug (voice)
Television:
* The Simpsons (1999-2021) - Various voices
* King of the Hill (1997-2010) - Various voices
* Family Guy (1999-present) - Various voices
* The Cleveland Show (2009-2013) - Various voices
* American Dad! (2005-present) - Various voices
* Avatar: The Last Airbender (2005-2008) - Various voices
* The Legend of Korra (2012-2014) - Various voices
* Batman: The Brave and the Bold (2008-2011) - Various voices
* Young Justice (2010-present) - Various voices
* Teen Titans (2003-2006) - Various voices
* Justice League (2001-2004) - Various voices
* Justice League Unlimited (2004-2006) - Various voices
* Static Shock (2000-2004) - Various voices
This is not an exhaustive list, but it gives you an idea of the breadth of Macgregor Cameron's work in movies and television.
It's important to note that he is primarily a voice actor, and while he may appear in some live-action productions, he is primarily known for his voice work.