Abstract
<title>Abstract</title> <p> The Cerulean Warbler <italic>Setophaga cerulea</italic> is a declining Nearctic–Neotropical migrant that breeds in eastern North America and spends the nonbreeding season mainly in montane forests and agroforestry systems of the northern Andes. In Brazil, the species has been treated as a vagrant and was historically supported only by undocumented sight records until the first published photographic record, from Santa Catarina state, southern Brazil in April 2018. Here we report a previously overlooked photographic record from 24 June 2016 at the Parque Ecológico Prof. Hermógenes de Freitas Leitão Filho, Campinas municipality, São Paulo state, southeastern Brazil. The record was originally submitted to eBird as Yellow Tyrannulet <italic>Capsiempis flaveola</italic> and was later reidentified as Cerulean Warbler through the eBird review process; the photographs are archived in the Macaulay Library as ML557030451 and ML557030461 and associated with eBird checklist S133558763. This represents the first documented record for São Paulo state and, by observation date, the earliest known photographic evidence of this species in Brazil. The June date is noteworthy because Cerulean Warblers are normally on their North American breeding grounds at this time. We comment on the record as evidence of vagrancy, possibly involving failed northbound migration, over-summering after previous displacement, or broader migratory misorientation, and emphasize the value of citizen-science platforms, expert review, and archived media for detecting extralimital records that may otherwise remain hidden under mistaken identifications. </p>