Josep Maria Sert i Badia (Catalan pronunciation: [ʒuˈzɛb məˈɾi.ə ˈsɛɾt]; Barcelona, 21 December 1874 – 27 November 1945, buried in the Vic Cathedral) was a Spanish muralist, the son of an affluent textile industry family.

Sert was commissioned in 1900 to paint the interior of the Vic Cathedral in the Province of Barcelona, Catalonia in murals, which took him more than 30 years to complete.

[1] In 1929 he was commissioned with the elaboration of a series of large forma canvases painted in his signature grisaille style intending to cover the walls of the reconverted San Telmo church in Donostia-San Sebastián; they portray different historic chapters of the Basques in an epic manner.

[7] In 1925, Sert met Georgian-Russian sculptor Isabelle Roussadana Mdivani, known as Roussy, who subsequently moved in with him and Misia.

[6] Sert began an affair with Roussy and later divorced Misia on 28 December 1927 to marry Mdivani.