Thomas A. Dine, also known as Tom Dine, is an American expert in foreign policy and Jewish advocacy, best known for his transformative leadership as Executive Director of the American Israel Public Affairs Committee (AIPAC) from 1980 to 1993, overseeing its expansion into a major lobbying force on U.S. policy toward Israel. During his tenure, he professionalized the organization's operations, significantly expanding its membership from around 10,000 to over 50,000, growing its grassroots mobilization efforts, and enhancing its lobbying influence. Under his guidance, AIPAC became a more structured and effective pro-Israel lobby, focusing on bipartisan congressional support. His tenure coincided with key events like the Lebanon War and the Oslo Accords, during which AIPAC's role in shaping U.S. aid to Israel grew substantially.

After leaving AIPAC, Dine pursued a diverse career in Jewish philanthropy, international broadcasting, U.S. government service, and Israeli government roles. He served as Chief Executive Officer of the Jewish Community Federation of San Francisco, leading fundraising and community programs for Jewish causes. From 1995 to 1999, he was President of Radio Free Europe/Radio Liberty in Prague, overseeing the broadcaster's adaptation to the post-Cold War era and promoting democratic values in Central and Eastern Europe. Dine also held the position of Assistant Administrator for Europe and the New Independent States of Eurasia at the United States Agency for International Development (USAID), where he managed billions in aid to support economic and political transitions in the region following the Soviet Union's collapse.

In his later years, Dine continued influencing U.S.-Israel policy as a senior policy advisor at the Israel Policy Forum (IPF) in Washington, D.C., advising on policy, programming, and development. His career reflects deep involvement in networks connecting Jewish organizations, U.S. government agencies, international NGOs, and the Israeli government, with a focus on democracy promotion and bilateral relations. Dine has been recognized for bridging advocacy and diplomacy, though his AIPAC era drew some criticism for its assertive lobbying tactics amid debates over U.S. Middle East policy.