This article reports on the development and the exploration of the underlying psychometric properties of the School Counselor Self-Advocacy Questionnaire, a measure of skills school counselors can use to advocate for their roles and programs. An exploratory factor analysis (N = 188) suggested a unidimensional model, and a confirmatory factor analysis indicated the overall model robustly explains the data, accounting for 80% of the variance. Cronbach's alpha reliability estimates ranged from 0.84 to 0.87 for the questionnaire and the estimates of concurrent validity were promising. Implications for school counselor advocacy practice are also included. (Contains 3 tables and 1 figure.)