The Abdus Salam International Centre for Theoretical Physics (ICTP) is a research center for physical and mathematical sciences, located in Trieste, Friuli-Venezia Giulia, Italy.

The center operates under a tripartite agreement between the Italian Government, UNESCO, and the International Atomic Energy Agency. It is located near the Miramare Park, about 10 kilometres from the downtown of Trieste, Italy. The centre was founded in 1964 by Pakistani Nobel Laureate Mohammad Abdus Salam.

ICTP is part of the Trieste System, a network of national and international scientific institutes in Trieste, promoted by the Italian physicist Paolo Budinich.

Research at ICTP is carried out by seven scientific sections:

The scientific community at ICTP includes staff research scientists, postdoctoral fellows and long- and short-term visitors engaged in independent or collaborative research. Throughout the year, the sections organize conferences, workshops, seminars and colloquiums in their respective fields. ICTP also has visitor programmes specifically for scientific visitors from developing countries, including programmes under federation and associateship schemes.

ICTP offers educational training through its pre-PhD programmes and degree programmes (conducted in collaboration with other institutes).

In collaboration with other institutes, ICTP offers masters and doctoral degrees in physics and mathematics.

In addition, ICTP collaborates with local laboratories, including Elettra Synchrotron Light Laboratory, to provide fellowships and laboratory opportunities.