Sept 22 (Reuters) - A non-profit group opposing race-based education policies has filed more than a dozen U.S. civil rights complaints this year against universities, challenging the legality of offering minority scholarships, summer study and residency programs to promote racial diversity.

The challenges are part of a growing campaign against diversity initiatives after a U.S. Supreme Court landmark ruling in June outlawed use of race in college admissions, commonly known as affirmative action. Conservative activists say the decision should extend to all educational programs, and some groups have also challenged corporate diversity policies.