<p>This study evaluated the factor structure of a measure of mental health literacy (MHL) tailored to the role of helping professionals and assessed its association with help-seeking intentions among a sample of 946 child-serving professionals. Confirmatory factor analysis was used to model different factor structures of MHL for supporting youth, item response theory examined item discrimination, and structural equation modeling tested the relationship between MHL for supporting youth and help-seeking intentions. Results provided support for a higher order factor of MHL for supporting youth, with four first-order factors (i.e., mental health knowledge, attitudes/beliefs, perceived behavior control, subjective peer norms). Item discrimination varied across observed items and first-order factors. The second-order, multidimensional MHL factor was positively correlated with help-seeking intentions. These findings provide an initial step in validating a measure of MHL that accounts for the specific work roles and population characteristics unique to at-risk youth and aligns with prior definitions of MHL and the Theory of Planned Behavior. Future research should seek to replicate these findings across diverse service settings.</p>