Yunus Social Business (YSB) is a non-profit organisation with an impact-investing arm, Yunus Funds, and a corporate social-innovation consulting arm, Yunus Corporate Innovation. Both business units are based on furthering the concept of social business.

YSB was co-founded by Muhammad Yunus, Saskia Bruysten and Sophie Eisenmann in 2011. Its stated mission is to "harness the power of business to end poverty and the climate crisis."

Prior to co-founding Yunus Social Business, Muhammad Yunus pioneered the field of micro-finance through Grameen Bank in his home country of Bangladesh. Muhammad Yunus and Grameen Bank received the Nobel Peace Prize for establishing microfinance and trying to tackle poverty. Grameen Bank became the first of several social businesses that Muhammad Yunus founded.^{[citation needed]}

In 2008, Muhammad Yunus and future YSB co-founder Saskia Bruysten met at the London School of Economics, where Muhammad Yunus was giving a talk on the promise of social business. Later, they exchanged contact information. This encounter led the former management consultant, Bruysten, to visit some of Muhammad Yunus' social businesses in Bangladesh. Bruysten then started setting up Grameen Creative Lab with a German entrepreneur, where her former BCG colleague Sophie Eisenmann later joined. In 2011, the trio agreed to co-found Yunus Social Business beyond Bangladesh.

YSB is active in six countries, with local offices in Brazil, Colombia, India, Kenya and Uganda.

Yunus Funds is the non-profit impact-investing arm of Yunus Social Business. It provides patient loans and post-investment support to social businesses in Brazil, Colombia, India, Kenya, Rwanda and Uganda. Yunus Funds covers the sectors Agriculture and Livelihoods, Health and Sanitation, Education and Training and Energy and Environment.

Social businesses financed by YSB include:

Yunus Corporate Innovation is the corporate social-innovation consulting arm of Yunus Social Business.