Locus of control within fundamental religious groups was studied. The fundamentalists' seemingly paradoxical belief in both internal and external locus of control was explored in a discussion of the history, theology and personality of fundamentalism. An empirical study compared locus of control in fundamental and liberal religious populations. On a religious revision of Rotter's Internal-External locus of control scale, fundamentalists were found to be significantly more external than liberals. This finding supports the theory that fundamentalists have a belief in an external locus of control. The results also support the idea that locus of control measures can be effectively adjusted for use with religious populations.