Stephen Rosner Bronfman (born 1964) is a Canadian businessman, investment executive, philanthropist, and environmental activist. He is the son of Charles Bronfman, a notable philanthropist and co-founder of Seagram, and continues the family legacy in investments and charitable work, particularly supporting Jewish causes and community initiatives. He serves as CEO of Claridge Inc., the Bronfman family office and investment firm, and as president of Clairvest Group Inc., a major Canadian private equity firm focused on middle-market investments. His business acumen has positioned him as a key figure in Canada's financial sector, managing substantial family assets and fostering strategic partnerships.

Beyond business, Bronfman holds significant political influence as the Chief Revenue Officer of the Liberal Party of Canada, responsible for fundraising and financial strategy. He previously acted as a senior advisor to Prime Minister Justin Trudeau, advising on economic and policy matters. This role has drawn attention to his connections within Liberal Party networks and his contributions to the party's electoral successes. Bronfman is also an advocate for environmental causes, aligning with broader philanthropic efforts that include education, arts, and social justice.

Residing in Montreal, Bronfman is the last male member of the Bronfman family to remain in the city's ancestral Bronfman stronghold, reflecting his deep ties to Quebec's cultural and economic landscape. His multifaceted career exemplifies the intersection of family wealth, political engagement, and social responsibility in shaping networks of influence in Canada.