The genus Graphis sensu Staiger is treated as a further contribution to the TICOLICHEN biodiversity inventory in Costa Rica. Graphis s.str. is the largest tropical lichen genus, with more than 300 accepted species worldwide, and also the largest in Costa Rica, with a total of 115 species recognized in this work. The following 25 species are described as new: Graphis altamirensis Sipman & Lücking sp. nov., G. argentata Lücking & Umaña sp. nov., G. bettinae Lücking, Umaña, Chaves & Sipman sp. nov., G. duplicatoinspersa Lücking sp. nov., G. firferi Lücking sp. nov., G. flavoaltamirensis Sipman & Lücking sp. nov., G. flavominiata Moncada & Lücking sp. nov., G. fournierii Lizano & Lücking sp. nov., G. gomezii Lücking, Will-Wolf & Umaña, G. gregmuelleri Sipman & Lücking, sp. nov., G. hypocrellina Lücking & Chaves sp. nov., G. inspersostictica Sipman & Lücking sp. nov., G. litoralis Lücking, Sipman & Chaves sp. nov., G. mirabilis Lücking, Sipman, Umaña & Chaves sp. nov., G. nudaeformis Lücking sp. nov., G. oryzaecarpa Lücking sp. nov., G. paradisserpens Sipman & Lücking sp. nov., G. paraserpens Lizano & Lücking sp. nov., G. pittieri Lücking, Umaña, Sipman & Chaves sp. nov., G. pseudocinerea Lücking & Umaña sp. nov., G. pseudoserpens Chaves & Lücking sp. nov., G. subflexibilis Lücking & Chaves sp. nov., G. subruiziana Sipman, Chaves & Lücking sp. nov., G. subturgidula Lücking & Sipman sp. nov., and G. tenoriensis Chaves & Lücking sp. nov. Graphis immersoides Lücking, nom. nov. [Bas. Graphina immersa Müll. Arg.; non Graphis immersa Fink], Graphis subchrysocarpa Lücking, nom. nov. [Bas.: Phaeographina ochracea C. W. Dodge; non Graphis ochracea Hepp], and Graphis submarginata Lücking, nom. nov. [Bas. Graphis marginata G. Mey. & Flot.; non Graphis marginata Raddi] are introduced as replacement names. Furthermore, 17 new combinations are proposed: G. bipartita (Müll. Arg.) Lücking, comb. nov., G. chondroplaca (Redinger) Lücking comb. et stat. nov., G. consanguinea (Müll. Arg.) Lücking, comb. nov., G. dichotoma (Müll. Arg.) Lücking, comb. nov., G. granulosa (Müll. Arg.) Lücking comb. nov., G. insulana (Fée) Lücking & Sipman, comb. nov., G. lutea (Chevall.) Aptroot, comb. nov., G. multisulcata (Müll. Arg.) Lücking & Chaves comb. nov., G. myrtacea (Müll. Arg.) Lücking, comb. n