Oei

OEI or Oei can refer to:

OEI

 * Obsidian Entertainment, Inc., a video game developer
 * Organization of Ibero-American States, known by the Spanish and Portuguese-derived acronym, OEI
 * Ozarks Entertainment, Inc., a former owner of the Dogpatch USA amusement park in the United States

Oei

 * Ōei, a Japanese era name spanning from 1394 to 1428

Surname

 * David Oei, Hong Kong-born American classical pianist
 * Madame Wellington Koo (born Oei Hui-lan), Chinese-Indonesian international socialite and style icon, briefly First Lady of the Republic of China
 * Oei Tiong Ham, Majoor-titulair der Chinezen, colonial Chinese-Indonesian tycoon in Southeast Asia
 * Oei Wie Gwan, Chinese-Indonesian businessman and founder of Djarum