The study aimed to identify the relation between the criteria of choosing a life partner and the emotional maturity as well as identify the statistical differences of the variables (gender, academic year and income level). The study was applied to a sample of (433) students (119 males & 413 females) from Nizwa University in Sultanate of Oman. To achieve the study objectives, the Researcher used the correlative descriptive approach and developed a questionnaire of Criteria of Choosing a Life Partner Scale included (36) items. The researcher also used the Emotional Maturity Scale (Singh & Bhargava, 1993) consisted of (48) items. The most prominent findings of the study were as follows: The study showed that the criteria of choosing the life partner among males were orderly as follows; the relationships with life partner dimension, personal dimension, educational and cultural dimension, economic dimension, and social dimension. While among females, they were orderly as follows: the relationships with life partner dimension, personal dimension, social dimension, economic dimension, and the educational and cultural dimension, The study demonstrated that the emotional maturity among males and females was high There was an inverse relationship between the emotional maturity and the criteria of choosing the life partner among males and there were no statistically significant relationship between the criteria of choosing the life partner and the emotional maturity dimensions among females, except for the statistically significant relationship between the social adjustment dimension and the social dimension. The study showed that there were no significant differences in all dimensions of the emotional maturity and Criteria of Choosing a Life Partner Scale among males, except for the personal and social dimensions in the first academic year, while they were only in the person dimension among females in favor of the first and third academic years. There were significant differences in the Criteria of Choosing a Life Partner Scale among males according to the variable of income level in the educational and cultural dimension favoring the students with social insurance, while there were no significant differences among females. There were significant differences between males and females in the Emotional Maturity Scale favoring females, except for the emotional stability dimension, so it is clear that females have high emotional maturity. The findings showed that there were no statistically significant differences in all dimensions of the emotional maturity according to the academic year variable. There were also no statistically significant differences in the level of emotional maturity according to the income level variable. There was also a statistical significance of the contribution of criteria of choosing the future life partner among males as predictors of emotional maturity in: the personal dimension and the relationships with life partner dimension, while they were not predictors among females. The study came out with a set of recommendations, most notably: Developing programs for providing youth with the skills and techniques of choosing the life partner and establishing specialized centers for guidance services before and after marriage throughout the Sultanate Governorates,