Adam Wright was one of three Bruins at the 2008 Olympics that won a silver medal in Beijing.
Horn, 87, is the winningest coach in UCLA men's water polo history.
Student-athletes must have played in 50 percent of the games and have over a 3.0 grade point average.
Alex Wolf and Nicolas Saveljic headline UCLA's All-America selections, both of whom were named to the first team for the first time in their careers.
All three players the Bruins have signed are from California, including one each from the Central Coast, San Diego and North Coast Sections of the CIF.
The Bruin senior class, which all redshirted, were part of three NCAA Championships.