Conspiracy theories often feature moral concerns and thrive when societal institutions are perceived as untrustworthy. However, limited research exists exploring whether moral concerns are associated with conspiracy thinking and if this link is strengthened when institutional trust is low. Two studies employing correlational ( N = 423) and experimental ( N = 381) designs found that liberty moral concerns, and to a lesser extent binding concerns, are associated with increased conspiratorial thinking, particularly when institutional trust is low. Moral concerns about liberty may contribute to increased conspiratorial thinking and low institutional trust may play a key role in exacerbating this link.