Portland Adventist Academy (PAA) is a private high school located in Portland, Oregon, United States operated by the Seventh-day Adventist Church. It is a part of the Seventh-day Adventist education system, the world's second largest Christian school system. The school was founded in 1910, and was previously known as Portland Union Academy, serving grades 1-12. The name changed when the elementary section became its own school, Portland Adventist Elementary School in 1975.