Oliver Frey (/freɪ/; 30 June 1948 – 21 August 2022) was a Swiss artist, who was based in the United Kingdom. He was known for his book and magazine illustrations, especially for British computer magazines of the 1980s. Under the pen name Zack, he became known for his erotic illustrations and erotic comics in British gay male porn magazines of the 1970s and 1980s.