The research explored the effect and relation between internal communication, communication effectiveness, and job satisfaction in retail supermarkets in Ireland. Methodology: Data was gathered from 100 frontline employees working in different organisations in retail Irish supermarkets. The quantitative data was gathered through a self-administered questionnaire and formulated questions related to the three variables of the research communication effectiveness, internal communication, and job satisfaction as well as demographic information about the respondents. Data Analysis: chi-square test & crosstabulation were used in SPSS version 25 to analyse the final data. Findings: The findings revealed a positive correlation between each of the variable’s Internal communication, communication effectiveness and job satisfaction. Value: The research highlights the significance of effective communication which aids in promoting employee job satisfaction besides enhancing employee performance. The research also highlighted the importance of internal communication in affecting the job satisfaction level of employees in the Irish retail industry.