The Isaac Newton University Lodge (INUL) is a Freemasons Lodge primarily for past and present members of Cambridge University. It is one of twenty-eight lodges in the masonic Province of Cambridgeshire and has a current membership of about 130. INUL has links with many university lodges within England and throughout the world and participates in the United Grand Lodge of England Universities Scheme.

The normal qualifying age for membership of a masonic lodge is 21 years but some lodges, including those of Oxford and Cambridge Universities, may initiate members under this age by dispensation of the Provincial Grandmaster.