A High Flux Reactor is a type of nuclear research reactor.

• High Flux Isotope Reactor (HFIR), in Oak Ridge, Tennessee, United States of America,
• High Flux Australian Reactor (HIFAR), Australia's first nuclear reactor,
• High-Flux Advanced Neutron Application Reactor (HANARO), in South Korea.
• The High Flux Reactor at Institut Laue–Langevin in France.
• High Flux Reactor (HFR) at Petten in the Netherlands