A major problem for many Nigerian manufacturing companies is still poor organisational communication, especially at Champion Brewery Plc, where systemic inefficiencies in information transmission, inadequate feedback systems, and departmental silos have resulted in misaligned goals, poor coordination, and decreased worker productivity. This study's primary goal was to investigate how Champion Brewery Plc employees' productivity is impacted by organisational communication. In particular, the study aimed to ascertain the impact of interdepartmental communication on employee productivity at Champion Brewery Plc, as well as the impact of information flow and communication feedback mechanisms on employee productivity. The study's population consisted of 142 employees and management staff, and it used a survey research design. Through the use of purposive sampling, a sample size of 104 respondents was established using Taro Yamane's formula at a 95% confidence level. Through the use of structured questionnaires, primary data was gathered, and SPSS 27.0 was used for descriptive statistics and basic linear regression analysis. The results showed that interdepartmental communication improved employee productivity (R = 0.941, R² = 0.885, p < 0.05), communication feedback mechanisms improved employee productivity (R = 0.900, R² = 0.810, p < 0.05), and information flow had a positive and significant effect on employee productivity (R = 0.958, R² = 0.918, p < 0.05). We came to the conclusion that all three communication dimensions are essential for operational effectiveness and workforce engagement, and that organisational communication at Champion Brewery Plc greatly increases employee productivity. It was suggested that Champion Brewery establish crossfunctional teams with common communication tools to enhance interdepartmental coordination, establish formalised feedback channels for employee participation, and invest in digital platforms for transparent information flow.