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Understanding neutral electron\u2013hole excitations (excitons) is key for predicting and improving the efficiency of energy-conversion processes in these materials. First-principles calculations have played an important role in this context, allowing for a detailed insight into the formation of excitons in many different types of perovskites. Such calculations have demonstrated that excitons in some perovskites significantly deviate from canonical models due to the chemical and structural heterogeneity of these materials. In this Perspective, I provide an overview of calculations of excitons in metal-halide perovskites using Green\u2019s function-based many-body perturbation theory in the GW + Bethe\u2013Salpeter equation approach, the prevalent method for calculating excitons in extended solids. This approach readily considers anisotropic electronic structures and dielectric screening present in many perovskites and important effects, such as spin\u2013orbit coupling. I will show that despite this progress, the complex and diverse electronic structure of these materials and its intricate coupling to pronounced and anharmonic structural dynamics pose challenges that are currently not fully addressed within the GW + Bethe\u2013Salpeter equation approach. I hope that this Perspective serves as an inspiration for further exploring the rich landscape of excitons in metal-halide perovskites and other complex semiconductors and for method development addressing unresolved challenges in the field.<\/jats:p>","DOI":"10.1063\/5.0187213","type":"journal-article","created":{"date-parts":[[2024,2,11]],"date-time":"2024-02-11T13:28:26Z","timestamp":1707658106000},"update-policy":"https:\/\/doi.org\/10.1063\/aip-crossmark-policy-page","source":"Crossref","is-referenced-by-count":27,"title":["Excitons in metal-halide perovskites from first-principles many-body perturbation theory"],"prefix":"10.1063","volume":"160","author":[{"ORCID":"https:\/\/orcid.org\/0000-0002-4361-4382","authenticated-orcid":false,"given":"Linn","family":"Leppert","sequence":"first","affiliation":[{"name":"MESA+ Institute for Nanotechnology, University of Twente , 7500 AE Enschede, The Netherlands"}],"role":[{"vocabulary":"crossref","role":"author"}]}],"member":"317","published-online":{"date-parts":[[2024,2,7]]},"reference":[{"key":"2024050320354329900_c1","doi-asserted-by":"publisher","first-page":"15251","DOI":"10.1038\/ncomms15251","article-title":"Coulomb engineering of the bandgap and excitons in two-dimensional materials","volume":"8","year":"2017","journal-title":"Nat. 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