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.

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).

No more than 100 living Honorary Fellows are permitted to be elected at any one time under the IOP's byelaws.

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