Erwin Sikowitz is the acting teacher and drama teacher of Hollywood Arts High School. He is portrayed by Eric Lange.
He himself is quite a strange man and often does odd things, such as drinking out of a coconut in class (he says coconut milk gives him "visions") and climbing into his classroom through the window. However, all of his students appear to like him and enjoy his class. He teaches Tori's first period improv class. His students appear to consider him as a good friend. In Freak the Freak Out, Tori and the rest of the group all run up and give him a big hug after his performance at Karaoke Dokie. Jade stated on TheSlap that Sikowitz is her favorite teacher despite his strangeness. Often, he writes odd facts about acting and performing arts on his white board, such as "Improv is like a fine cheese, but not really", and "Theater is life, film is art, TV is furniture." He is the only teacher at Hollywood Arts to have a TheSlap page, because the students who made his page would get extra credit (although the guidance counselor and one of the food distribution staff also have them). He also tried to do a standing backflip and his body hit the floor hard.
Sikowits's name might have originated from psyco and wits, judging by his personality.