This article aims to examine the influencing factors towards the effectiveness of the trade union from the perspectives of public sector union members. The present study used a quantitative research method involving a survey among 114 union members of Kesatuan Kakitangan Umum, Universiti Teknologi MARA (KKUUiTM). The findings revealed two important findings. First, the union members disclosed that their union was effective. Second, union strength and union leadership significantly influence trade union effectiveness. This research will help the union understand their strength and continuously improve its leadership to maintain its trade union effectiveness and contribute to greater union performance.