Rock Island High School Alleman Catholic High School is a private, Catholic high school in Rock Island, Illinois.

It is the second largest Catholic high school in the Quad Cities.

Its first principal was Father John F. O'Connor.

Available for the male students are baseball, basketball, cross country, football, golf, soccer, tennis, track & field, and wrestling.

Female students have cheerleading, basketball, cross country, the Emeralds dance team, soccer, softball, tennis, track & field, golf, and volleyball available.