Coach Z is a fictional character in the Homestar Runner series of animated cartoons. As his name implies, he is the coach of the athletic team on which Homestar Runner and some of his friends play. He is also green, and it is unclear whether this is skin or some kind of body suit.

Coach Z's primary gag is his thick and occasionally incomprehensible Pittsburghese/midwestern accent. An early profile suggested he came from a "foreign country". This accent causes various mutations in common English, for example, the word "job" comes across as "jorb", "jaerb", or even "jorearb". He claims to have been a hip-hop star in his home country and is a fan of the Wu-Tang Clan, Digital Underground and Flavor Flav of Public Enemy.

His favorite piece of advice, which he suggests to Homestar at various points, is "It's like a great sports play. You can't just rush into the score zone." This little gem seems to apply to any type of situation, even the ones in which it makes absolutely no sense.

Coach Z has had two Powered by The Cheat music videos: "Hip Hop Dance" and "These peoples try to fade me". The latter appears on the Strong Bad Sings CD.