Teleost fishes represent the most taxonomically diverse group of living vertebrates, and occupy a vast range of ecological niches. Morphological diversity is particularly notable in the skull. Understanding how this diversity has evolved in the ~250 million year history of teleosts presents a challenge because of the complex three-dimensional structure of the teleost skull and the number of species involved. Modularity, or the division of complex structures such as the skull into a smaller number of integrated, independent units known as modules, provides a solution to this problem. The skulls of many tetrapod clades have been shown to be highly modular but, most fish studies have focused on the neurocranium or overall body form. Here we present an analysis of skull modularity in ~50 species of the morphologically diverse but numerically tractable teleost group Pelagiaria. Using three-dimensional geometric morphometrics, our analysis encompasses the neurocranium, jaws and operculum, enabling an analysis of morphological diversity across the entire skull and allowing a more direct comparison to previous tetrapod studies. Our results show that the teleost skull is highly modular, and that morphological disparity is highest around the supraoccipital crest, the posterior region of the maxilla, and at the proximal and distal regions of the lower jaw. The otic capsule region shows the lowest disparity. These preliminary findings suggest that modularity plays an important role in shaping morphological diversity in this clade. Our findings represent an important first step towards broader investigations of teleost modularity, and a more comprehensive understanding of drivers of vertebrate biodiversity.