Neil Alexander Steven Brockdorff FRS FMedSci FRSB (born 1958) is a Wellcome Trust Principal Research Fellow and professor in the department of biochemistry at the University of Oxford. Brockdorff's research investigates gene and genome regulation in mammalian development. His interests are in the molecular basis of X-inactivation, the process that evolved in mammals to equalise X chromosome gene expression levels in XX females relative to XY males.