Despite the advancements and achievements made by banking and financial institutions, deposit money banks, especially in Nigeria, continue to face challenges in terms of employee attitudes toward work and customers. Low dedication, low work satisfaction, poor constructive conduct, and low employee loyalty are evident in employee attitude issues. Hence, this study examined the effect of management support on employee commitment to selected Deposit Money Banks in Lagos State, Nigeria. A survey research design was adopted. The population was 568 directors, top management staff and human resources managers of six selected deposit money banks in Lagos State, Nigeria. A sample size of 292 was found usable. Stratified random sampling was adopted. A validated questionnaire was used to collect data. Cronbach’s alpha reliability coefficients for the constructs ranged from 0.76 to 0.88. The response rate was 86.9%. Data were analyzed using descriptive and inferential statistics. The results of the hypothesis showed that there is a significant effect of management support on employee commitment of the selected deposit money banks in Lagos State, Nigeria. The study recommended that management should give adequate support to their employees to enhance their organizational commitment, as supported by numerous existing studies in the past.