Brit Marling as Prairie Johnson / The OA
Emory Cohen as Homer Roberts
Scott Wilson as Abel Johnson
Phyllis Smith as Betty Broderick-Allen
Alice Krige as Nancy Johnson
Patrick Gibson as Steve Winchell
Brendan Meyer as Jesse
Brandon Perea as Alfonso "French" Sosa
Ian Alexander as Buck Vu
Jason Isaacs as Dr. Hunter Aloysius "Hap" Percy