Kasit Piromya (Thai: กษิต ภิรมย์; RTGS: Kasit Phirom; born 15 December 1944 in Thonburi) is a Thai diplomat, Democrat Party politician, and former People's Alliance for Democracy ("Yellow Shirts") activist.

After that, he returned to higher education at the Faculty of Political Science, Chulalongkorn University.

He admitted to Chulalongkorn University for a period of time and applied for a bachelor's degree in International Affairs at the School of Foreign Service, Georgetown University, USA.

He has served as the ambassador to the Soviet Union and Mongolia, Russia and the former Soviet republics, Indonesia and Papua New Guinea, Germany, Japan, and the United States.

Kasit has received the following royal decorations in the Honours System of Thailand: