The heightened demand for corporate accountability and the complexity of financial systems has
expanded the role of accountant beyond traditional reporting to encompass broader
responsibilities to promote transparency, accountability, and sustainable growth. This study
examines how accountants contribute to these outcomes, with evidence from Nigeria as a
representative developing economy. Anchored on agency and stakeholder theories, the study
adopts a descriptive survey design, drawing on data from 435 accounting professionals across
public and private sector organizations. Using multiple regression analysis, the findings reveal
that financial reporting quality significantly enhances transparency (β = 0.642, p < 0.05)., while
professional ethics strengthens accountability (β = 0.587, p < 0.05). In addition, sustainability
reporting is positively associated with sustainable growth (β = 0.611, p < 0.05), and compliance
with regulatory frameworks improves organizational performance (β = 0.559, p < 0.05). The study
contributes to the literature by providing integrated empirical evidence linking core accounting
functions to governance and sustainability outcomes in a developing country context. It
underscores the strategic importance of the accounting profession in advancing institutional trust
and long-term value creation. Policy implications include strengthening ethical enforcement,
promoting sustainability reporting practices, and enhancing regulatory oversight to improve
corporate governance and economic resilience.