Omidyar Network is a self-styled "philanthropic investment firm," composed of a foundation and an impact investment firm. Established in 2004 by eBay founder Pierre Omidyar and his wife Pam, Omidyar Network has committed over US$1.5 billion to nonprofit organizations and for-profit companies across multiple investment areas.

The organization is based in Redwood City, California, with an office in Washington, D.C., United States.

The Omidyar Network comprises a 501(c)(3) and a Limited Liability Company (LLC), and part of The Omidyar Group. It was established in 2004 by Pierre Omidyar and his wife, Pam.

By 2025, Omidyar Network had awarded almost $2 billion to more than 700 organizations, encompassing spending on grants to nonprofits and investments in for-profit companies.

As of 2022, the CEO of Omidyar Network is Mike Kubzansky. Its board of directors include the managing directors of The Omidyar Group, Jeff Alvord and Pat Christen and in 2023 Michele Jawando was senior vice president for programs.

Jawando became president of the organization in 2025. Pam Omidyar is also on the organization's board, which in 2023 added Marta L. Tellado and Mona Sutphen.

Omidyar Network invested in the microfinance sector, including Unitus Inc.

In 2009, the Omidyar Network donated $2 million over two years to the Wikimedia Foundation, and during that same time, Matt Halprin of Omidyar Network was appointed to Wikimedia's board of directors.