GradeAUnderA (short for Grade A Under-Achiever, commonly referred to as Grade) is a British comedian best known on YouTube for his comedic rants as well as opinion pieces and commentary on a diverse variety of issues. Grade additionally livestreams on Twitch, usually playing video games. He kept his real identity anonymous until his 2 million subscribers special, and uses drawn characters dubbed "Grade" and "Under" to show expressions and actions in his videos.

He has a personal rivalry with Actor and fellow YouTuber Tyrone Magnus.

In the past, Grade has been critical of fellow Youtuber Ray William Johnson, who he accused of plagiarising one of his videos. This was met with scrutiny by some, including The Daily Dot.