Fellowship of the Institute of Physics (FInstP) is "the highest level of membership attainable" by physicists who are members of the Institute of Physics (IoP), "for those with a degree in physics or related subject (or equivalent knowledge gained in the workplace) and who have made a significant impact on their sector"; it is for "distinguished physicists in recognition of their accomplishments". ^[1]

Honorary Fellowship (HonFInstP) is for "exceptional individuals" who can be nominated in recognition of having "contributed to physics generally or to the work of the IOP", working in fields including business, education, research, and policy relating to physics.^[2] The Institute's bye-laws limit the number of fellows in this category to being not more than 100 living Honorary Fellows at any one time.

Fellows are entitled to use the post-nominal letters FInstP, and receive a number of minor benefits such as a subscription to Physics World magazine (like other members of the IOP). As of 2022^[update] fellows include:

See also Category:Fellows of the Institute of Physics

The designation of Honorary Fellow of the Institute of Physics, as an honorary title. The award of Honorary Fellowship is "the highest accolade presented by the Institute of Physics to reflect an individual's exceptional services to physics".^[2] Awardees are entitled to use the post-nominal letters HonFInstP. No more than 100 living Honorary Fellows are permitted to be elected at any one time under the IOP's byelaws.

Recipients have included:^[6]