This study aimed to determine the relationship between social support and assertiveness among university students. It helps the caseworker understand the conditions and factors that affect the development of assertiveness or achieving social support among clients. It adopted the analytical descriptive method. It applied the social support questionnaire and the assertiveness scale to a randomly selected sample of (360) university students: (190) males and (170) females. The results showed that there is a statistically significant positive relationship at the level of 0.01 between social support and its domains (support from the family, support from colleagues and friends, and support from the university) and assertiveness among university students. Gender (male or female) and the type of study (scientific or humanities) affect this relationship. The study recommends consolidating the examination of the relationship between social support and assertiveness across various cultures, as well as the impact of the demographic and academic characteristics of students on this relationship.