This essay provides a comprehensive analysis of the decline of trade unions in Australia, examining the significant drop in membership since the 1980s. It delves into the functions and importance of trade unions, highlighting their role in representing workers' interests and negotiating on working conditions and wages. The essay explores key factors contributing to this decline, including structural changes in the labor market, employer strategies, and institutional factors, referencing the views of experts like David Peetz. The essay presents data on union density, comparing trends across different sectors, employment statuses, and international contexts, and discusses the impact of factors such as casual employment, the rise of small businesses, and changing employee attitudes toward unions. The analysis considers the impact of union amalgamations, individual-level recruitment, and the changing role of women in the workforce, concluding with a call for strategic reforms to regain public trust and adapt to contemporary market ideologies.