Internal-external locus of control was studied in relationship to the religious phenomena "glossolalia." Contrary to the main hypothesis formulated, glossolalics were found significantly more internal in locus of control than non-tongues speakers. Intercorrelations were studied between the variables of I-E, age, length of church membership, income level, educational level, and perceived control by God, for tongue-speaker and non-tongue-speaker groups. Chisquare comparisons were made between the groups on educational level, income level, and perceived control by God, with significant differences being found in educational level. Additional analysis was made between I-E and the variables of educational levels, income levels, and perceived control by God. Historical and current interpretations of the personality of glossolalics are challenged. The construct validity of the Rotter scale for use with religious populations is challenged.