Assumption Catholic Primary School is the third and most successful establishment of a Catholic School in Mandurah. It was planned by the Catholic Education Commission that a new Catholic systemic school would be developed in stages. It was to be under the Principalship of a Presentation Sister.
In 1982, the school opened with 91 children from years 1 to 6. The following year, the enrolments increased to 150 with the addition of a Year 7 class. An ongoing building programme over subsequent years has seen the school develop to a two-streamed Kindergarten to Year 7 school.
In 1998, the school came under the leadership of its first lay principal.