Otgonbayar is a Mongolian surname and given name. Notable people with the name include:
*List of Hurd band members#Dambyn Otgonbayar, Dambyn Otgonbayar (born 1973), Mongolian guitarist
*Ishdorjiin Otgonbayar (born 1968), Mongolian football coach
*Luvsanlkhündegiin Otgonbayar (born 1982), Mongolian runner
*Otgonbayar Oyunbaatar (born 1993), Mongolian footballer
*Ravsalyn Otgonbayar (born 1955), Mongolian boxer
{{Given name, type=both
Mongolian-language surnames
Mongolian given names