This study examined the impact of workplace diversity and organizational culture in the Maritime industry in Nigeria. Emphasis was placed on workplace diversity dimension: education diversity, ethnic diversity, gender diversity, age diversity, and how they relate to organizational culture. The descriptive survey research design was adopted using a structured questionnaire to elicit information from the respondents. The population of the study comprised of all employees of NPA (Nigerian Ports Authority) and NIMASA (Nigerian Maritime Administration and Safety Agency). A total number of 240 employees selected using a convenience sampling technique. The data collected were analyzed with a simple percentage and the hypotheses were tested using Pearson correlation with Statistical Packages for Social Sciences. The finding of the study revealed that education diversity, ethnic diversity, gender diversity, age diversity all have a positive and significant impact on organizational culture. Thus, the study concluded that the promoted and accepted level of organizational culture is primarily determined by the encouragement and dimensions of workplace diversity in the organization. Therefore, it is recommended that the organization should promote effective workplace diversity.