"We can't have full knowledge all at once. We must start by believing; then afterwards we may be led on to master the evidence for ourselves"


Welcome to St. Thomas Aquinas
Catholic High School

Guam's newest Archdiocesan Catholic co-educational high school offering a college preparatory academic program that challenges and develops its students to become moral and productive citizens with global perspectives firmly rooted in the Gospel of Jesus Christ through the teachings of the Catholic Church.


STA Online Payment


NHS Soup Kitchen


STAy for Christ Easter Egg Hunt with Dominican Child Development Center.


NHS volunteered at St. Dominic's Senior Care Home this past Saturday. They entertained the man'amko.

Mock Trial 2015

More Photos


Photo Courtesy of Erin Barrer


St Thomas wins 6th Mock Trial Championship.
Best Witness Award 1 & 2: Cori Aguon and Camille Lobo

Best Attorney Award 2: Caleb Skvaril

Photo Gallery


St. Thomas earns GOLD at the Tumon Bay Music Festival held on March 13, 2015. Photo Gallery