Shain Mahaffey Neumeier (born 1987) is an American autistic and nonbinary transgender attorney from Los Angeles, California. Neumeier advocates against coercive and forced treatment, including advocacy to close the Judge Rotenberg Center, an institution for people with developmental disabilities. They are also an activist for autism rights, disability rights, youth liberation, asexuality, and transgender rights. Neumeier has multiple disabilities including post-traumatic stress disorder, cleft lip and palate, ectodermal dysplasia, and depression.