Paul Horiuchi (1906–1999) was an American painter and collagist. He was born in Oishi, Japan, and studied art from an early age. After immigrating to the United States in his early teens, he spent many years as a railroad worker in the Western U.S. In 1946, he moved to Seattle, Washington, where he eventually switched his focus from painting to collage and came to be associated with the "Northwest School" of artists. In his mid-forties, he was finally able to devote himself to art full-time, his unusual collage style becoming very popular in the 1950s and 60s. He continued creating art at his studio in Seattle until succumbing to Alzheimer's-related health problems in 1999.