Libran Nuevas Cabactulan (born February 20, 1950) is a Filipino career diplomat, who served as the 18th Ambassador and Permanent Representative of the Philippines to the United Nations, replacing former Ambassador and retired Chief Justice Hilario Davide, Jr.

Prior to his appointment, he served as Assistant Secretary for Nuclear Disarmament and Non-Proliferation.

During his diplomatic career, Libran Cabactulan led the Group of 77 developing countries and China in negotiations on economic and related issues at the General Assembly, the Economic and Social Council, the Commission on Sustainable Development, the Population Commission, United Nations Children’s Fund, and the United Nations Development Programme.

Before joining foreign service, he worked at the National Economic and Development Authority (NEDA) as a Staff Economist.

He obtained his Bachelor’s and Master’s Degrees in Political Science, and a Certificate in Development Economics from the University of the Philippines.