Introduction. Transhumanism is a movement that emphasizes the improvement of the human condition by developing technologies and making them widely available. Conspiracy theories regularly refer to the allegedly transhumanist agenda of elites. We hypothesized that belief in conspiracy theories would be related to more unfavorable attitudes toward the transhumanist movement. Methods. We examined this association through two pre-registered studies (based on two French samples, total N after exclusion = 550). Results. We found no evidence of a negative relationship between belief in conspiracy theories and attitudes toward transhumanism. This null result was further corroborated by Bayesian analysis, an equivalence test, and an internal mini meta-analysis. Conclusion. This work plays a precursory role in understanding attitudes toward an international cultural and intellectual movement that continues to grow in popularity and influence.