{{short description|14th century Talmudist and authority on Jewish law}}
'''Nissim ben Reuven''' (13201290 – 9th of Shevat, 1376, {{lang-he|נִסִּים בֶּן רְאוּבֵן}}) of [[Girona]], [[Catalonia]] was an influential [[talmud]]ist and authority on [[Halakha|Jewish law]]. He was one of the last of the great Spanish medieval Talmudic scholars. He is also known by his [[Hebrew language|Hebrew]] [[acronym]], the '''RaN''' ({{Script/Hebrew|ר"ן}}), or else with the definite article '''HaRaN''' ({{Script/Hebrew|הר"ן}}), as well as by the name '''RaNbaR''' ({{Script/Hebrew|רנב"ר}}), the [[Hebrew language|Hebrew]] acronym of his full name, including his father's name, Reuven ({{Script/Hebrew|ראובן}}),<ref>Nimukei Yosef, Bava Metzia, {{Script/Hebrew|'ע"א, עמוד ב}}: on Gemara {{Script/Hebrew|בבא מציעא עמוד קט"ז עמוד א}}</ref> and also by '''Nissim Gerondi'''.
