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This paper describes the development and psychometric evaluation of a brief self‐report measure (BEACON) to inform universal mental health screening in schools. Items assess symptoms and impairment associated with anxiety and attention/hyperactivity problems (grades 4–11) as well as depression and eating difficulties (grades 6–11), with optional items for suicidality and self‐harm (grades 7–11). Initial item examination based on Item Response Theory (IRT) and classical test theory involved 3844 students in grades 4 through 11 (Study 1) and identified 18 items for grades 4–5 and 31 items for grades 6–11 that fulfilled pre‐set criteria. Study 2 extended testing with 10,479 students in grades 4–11 and added an additional four items assessing impairment associated with eating difficulties for older students (grades 6–11) creating a total of 35 items for grades 6–11. All items, for both grade‐level versions, met the pre‐set criteria for IRT and classical test theory analysis supporting their strength in the measurement of the dimensions of concern. The measure showed good reliability (subscale alphas.87 to.95). Validity was also demonstrated against standard symptom measures, school grades, school absenteeism, and help‐seeking. The BEACON appears to be a psychometrically sound measure to use in the first stage of school‐based screening for mental health problems. [ABSTRACT FROM AUTHOR]