Locals of Control is considered one of the main imporment factors on responsible environmental behaviors(REB). It is defined as an individual`s perception of his or ha ability to bring about change through his a her behavior. This psychological construct is divided in two, external and internal. Internal locus of control(ILOC) is imporment as predictor for responsible environmental behaviors. This study was conducxed to investigate the IACUS of Control and relations with REB in Undergaduate Students. The data were collectcd mainly through questionnaires and a total of 157 responded questionnaires was analyzed for the study. The statistical methods used in this study were fiequency, percentile and oorreladon. The major findings of this study were (1) Most of undergraduate students had internal locus of control(75.2%). (2) According to region, coral students showed high levels in ILOC and REB.