| birth_place = Guapé, Minas Gerais
| death_date =
| death_place =
| nationality = Brazilian
| fields = Mathematics
| workplaces = Instituto Nacional de Matemática Pura e Aplicada (1974–2016)
| alma_mater = Instituto Nacional de Matemática Pura e Aplicada
| thesis_title = Structural Stability of Diffeomorphisms on Two-Manifolds
| thesis_year = 1973
| doctoral_advisor = Jacob Palis
| doctoral_students = Artur Avila
| known_for = Contributions to dynamical systems theory
| awards =
}}
Welington Celso de Melo (17 November 1946 – 21 December 2016) was a Brazilian mathematician. Known for his contributions to dynamical systems theory, he served as full professor at Instituto Nacional de Matemática Pura e Aplicada from 1980 to 2016. Melo wrote numerous papers, one being a complete description of the topological behavior of 1-dimensional real dynamical systems (co-authored with Marco Martens and Sebastian van Strien).
He proved the global hyperbolicity of renormalization for ''r'' unimodal maps (co-authored with Alberto Pinto and Edson de Faria). He was a recipient of the 2003 TWAS Prize.
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