Pierre Berthelot

{{Short description|French mathematician (1943–2023)}}

{{About||the martyred Carmelite missionary|Denis of the Nativity}}

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{{Infobox scientist

| name = Pierre Berthelot

| image = Pierre Berthelot.jpeg

| image_size =

| caption = Berthelot in 1981

| birth_date = {{birth date|1943|1|27|df=yes}}

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| death_date = {{death date and age|2023|12|7|1943|1|27|df=yes}}

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| nationality = French

| fields = Mathematics

| workplaces = University of Rennes

| alma_mater =

| doctoral_advisor = Alexander Grothendieck

| doctoral_students =

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}}

Pierre Berthelot ({{IPA|fr|bɛʁtəlo|lang}}; 27 January 1943 – 7 December 2023){{Cite web |title=Décès de Pierre Berthelot {{!}} Société Mathématique de France |url=https://smf.emath.fr/actualites-smf/deces-de-pierre-berthelot |access-date=10 December 2023 |website=smf.emath.fr}} was a French mathematician at the University of Rennes. He developed crystalline cohomology and rigid cohomology.