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Roland Brasseur, a retired French math teacher, maintains a website "Les mathématiciens du cimetière du Montparnasse" on which he records all the mathematicians buried in the large Montparnasse Cemetery in Paris. As of June 2022 he had identified 158 mathematicians there.
Under the update for April 7, 2020, one finds:
PUISEUX Victor. 1820-1883. ENS. Maître de conférences à l'ENS, astronome à l'observatoire de Paris, professeur à la Sorbonne, Bureau des longitudes.
Clicking on the name leads to a PDF document that provides much detailed biographical information about Victor Puiseux. At the top of the document one finds the location of Puiseux's grave within the cemetery: division 14, 2 Sud, 28 Ouest. Towards the end of the document there is a picture of the grave as photographed by the author in 2008.