Background: Parents' personal psychotherapy experiences can shape their expectancies of mental health treatment for themselves and offspring. For instance, parents with negative psychotherapy experiences may view mental health treatment as less likely to be helpful--and seek treatment at lower rates--for themselves and their children. However, these associations are not absolute. One potential moderator may be parents' "beliefs about failure" as debilitating versus enhancing. Objective: We tested whether beliefs about failure moderated links between parents' own past psychotherapy experiences and their expectancies for future psychotherapy, both for themselves and offspring. Method: One-hundred and forty-three parents with a history of receiving psychotherapy reported on beliefs about failure, past psychotherapy experiences, and future psychotherapy expectancies and preferences, for themselves and their offspring. All measures were completed through mTurk, an online method of collecting survey data. Results: Parents perceiving their own past psychotherapy as ineffective held significantly lower expectancies that psychotherapy would benefit their offspring and were more likely to decline hypothetical treatment for offspring. These relations were significantly stronger among parents holding "failure-is-debilitating" beliefs, versus those with "failure-is-enhancing" beliefs. Parents' reporting negative past therapy experiences had lower expectancies for their own future therapy regardless of failure beliefs. Conclusions: "Failure-is-enhancing" beliefs may strengthen parents' confidence that psychotherapy can benefit their children, especially in parents with negative treatment experiences themselves.