The purpose of this study was to investigate the relationship between personality types and second language acquisition. The study addressed a problem that is inadequately investigated in foreign language acquisition research; specifically, personality traits as predictors of language learning in college students studying Spanish as a foreign language. The researcher conducted one sample t-tests to assess statistically significant differences between mean personality type score and the test value, as well as, a multiple linear regression analysis. A convenient sample of college students (n = 52) completed the Neris Personality Type Indicator at the beginning of the course, and took several examinations throughout the semester. Personality traits were correlated with examination grades. The results of the analysis indicated that personality types were not related to second language acquisition. The results of the multiple linear regression analysis were not significant, F (5,46) = 0.39, p = 0.85, R[superscript 2] = 0.04, indicating that the model consisting of the personality types contributed to 4% of the variance in test grade. Because the model was not statistically significant, the researcher did not evaluate the individual predictors. [The dissertation citations contained here are published with the permission of ProQuest LLC. Further reproduction is prohibited without permission. Copies of dissertations may be obtained by Telephone (800) 1-800-521-0600. Web page: http://www.proquest.com/en-US/products/dissertations/individuals.shtml.]