Charles Marvin Green Jr. (October 16, 1950 – December 10, 2017), better known as Angry Grandpa (often times abbreviated as AGP), was an American YouTuber.

Videos of Green under the moniker "Angry Grandpa", recorded by his son Michael, first started appearing on the internet in 2007.

In the videos, which became known for its prank style,[6] Green is seen reacting to his son's provocations by screaming profanities and destroying furniture, kitchen appliances, and technology.

[5][7] While questions have been raised regarding the authenticity of the channel's content, including by fellow YouTuber Ray William Johnson,[10] Green's son has credited his father's bipolar disorder for the rage-driven outbursts seen in the videos.

[5] Green had dealt with several medical conditions, including pneumonia, kidney stones, and skin cancer, the last of which had gone into remission.