Redescriptions and descriptions as new of Opiinae of the Old World. The following species of the Old World are redescribed or described as new: Aspilodemon loksai Papp comb nov. (Opius loksai) (New Guinea), Biosteres spinaciae ab. fissus (Jakimavicius) (Brjansk, USSR), Biosteres townesi Papp (India), Bitomus pamboloides (Tobias) (Moldavia), Diachasma diachasmoides (Tobias) (Moldavia), Opius (Nosopoea) areatus Tobias (Ural), Opius (Allotypus) arenaceus Jakimavicius (Ukraine), Opius (Aulonotus) bulbutus Papp: (New Guinea), Opius (Gastrosema) caucasi TOBIAS (Caucasus), Opius (Utetes) clavifemoralis Tobias (Lithuania), Opius (Nosopoea) cyphus PAPP (Uganda), Opius (Merotrachys) derus Papp (North Korea), Opius (Gastrosema) entzi PAPP (Ghana), Opius (Apodemia) marjoriae Papp (India), Opius (Hypocynodus) mongolaltaiensis sp. n (Mongolia), Opius (Apodesmia) nadus Papp (India), Opius (Utetes) pestes Papp (India), Opius (Nosopoea) propecubitalis Papp (India), Opius (Gastrosema) quasiqvisti sp. n. (Slovakia), Opius (Opiostomus) riphaeus Tobias (Ural), Opius (Apodesmia) rugosiusculus Jakimavicius (Lithunia), Opius (Odontopoea) signicella sp. n. (Slovakia), Opius (Nosopoea) subcirculator Tobias (Ural), Opius (Opiognathus) subhilaris Jakimavicius (Moldavia), Opius (Opius) subpallipes Tobias (Moldavia), Opius (Utetes) tarasi Tobias (Ukraine), Opius (Utetes) townesianus PAPP (India), Opius (Aulonotus) transitus PAPP (New Guinea), Opius (Agnopius) uvarovi Tobias (Stawropol). The systematic position is discussed and the integration in a system for identification is proposed. Morphological details are figured.