Introduction: Health care organizations can not achieve success without effective workforce one of the variables that can affect the efficiency of nurses is job involvement. So, the assessment of individual and organizational variables affecting the job involvement is important.

Aim: The aim was to assess of simple and multiple relationships between individual and organizational variables and job involvement among nurses.

Methods and Materials: This study was   a correlational studies that for the implementation among nurses of Ahvaz general hospitals a sample of 313 subjects (214 female nurses and 27 male nurses) was selected using Cochran formula and those who met the inclusion criteria, stratified random sampling method systematically in 2014. Samples were evaluated using Niehoff and Moorman's organizational justice inventory (1993), NEO (1992) five-factor inventory (NEO-PI-R) and Edwardes & Killpatric’s occupational stress (1984) inventory. For all questionnaires internal consistency reliability (Cronbsch’salpha) were in range 0.62 to 0.81. The data were analyzed using linear regression analysis with enter method and path analysis by SPSS-₁₉ and AMOS-20.

Results: The findings showed that, dimensions of organizational justice, extraversion and conscientiousness are able to predict job involvement. Among the dimensions of organizational justice, procedural justice is only able to predict the factor of extraversion and distributive justice and procedural justice was able to predict the conscientiousness of nurses. The findings showed that 32% of the variance in job involvement can be subject to the individual characteristics of extraversion and conscientiousness and explain the organizational justice.

Conculusion: It is suggested to nurse managers for providing organizational justice and also focusing on the individual characteristics of extraversion and conscientiousness can increase job involvement and consequently to improve their performance and patient satisfaction may be considered.