The thick-billed seedeater (Crithagra burtoni) is a species of finch in the family Fringillidae. It is native to the Western High Plateau and Bioko, the Albertine rift montane forests and the East African montane forests
The thick-billed seedeater was formerly placed in the genus Serinus but phylogenetic analysis using mitochondrial and nuclear DNA sequences found that the genus was polyphyletic. The genus was therefore split and a number of species including the thick-billed seedeater were moved to the resurrected genus Crithagra.