Gestaltung:
 Fritz Geller-Grimm
 Inhalt:
 Dr. Frank Menzel

• Oak-cancer DENGLER [4(1): 143-164]
• Oberösterreich SCHEDER [8(2): 607-612]
• Obituary BROWN [10(1): 353–356] - - KOTRBA [17(1/2): 3-11]
• Odiniidae MÁCA [17(1/2): 257-265]
• Öko-faunistische Charakterisierung BÄHRMANN [14(1): 3-16]
• Ökologie WERNER [Suppl. 1] - - GANEVA et al. [9(2): 743-755] - - POLLET et al. [10(2): 549-557] - - FAKHER et al. [11(2): 603-608] - - KEIL [12(1): 87-92] - - BÄHRMANN [13(2): 377-389] - - WERNER et al. [14(1): 231-257] - - HIBBERT et al. [14(1): 97-105] - - WERNER [Suppl. 14] - - NUNES-SILVA et al. [17(1/2): 177-185]
• Öko-Typen MEYER et al. [5(1): 123-144]
• Österreich ŠEVCÍK [8(1): 143-152] - - MICHELSEN [8(1): 323-326] - - MENZEL et al. [8(2): 355-409] - - SCHEDER [8(2): 607-612]
• Oestridae ZIEGLER [Suppl. 3]
• Oestroidea ZIEGLER [Suppl. 3]
• Offline English - - German
• Old World PAPE et al. [6(1): 63-78]
• Oman BLACKITH et al. [6(2): 239-250]
• Ommatini SCARBROUGH et al. [7(1): 93-108]
• Opomyzidae ZUIJLEN [6(1): 129-134] - - ZUIJLEN [6(1): 205-206] - - KOTRBA et al. [9(1): 57-71] - - VAN ZUIJEN [15(1/2): 305-308]
• Optische Signale SIVINSKI et al. [11(1): 313-322]
• Order (Studia dipterologica & Supplement)
• Oregon STARÝ [2(2): 207-213]
• Oriental region SCARBROUGH et al. [7(1): 93-108] - - KALLWEIT [8(2): 441-446] - - OZEROV et al. [8(2): 563-570] - - BOSE et al. [9(2): 375-377] - - HRADSKÝ et al. [9(2): 379-392] - - ROTHERAY [10(1): 219–226] - - HIPPA et al. [11(2): 405-428] - - GUO et al. [11(2): 493-499] - - SHAMSHEV et al. [12(1): 109-117] - - WEIPERT et al. [12(2): 319-330] - - SHAMSHEV et al. [12(2): 331-336] - -MENZEL et al. [13(2): 209-229] - - BROWN [15(1/2): 185-187] - - GROOTAERT et al. [15(1/2): 165-174]
• Orientalis SCARBROUGH et al. [7(1): 93-108] - - KALLWEIT [8(2): 441-446] - - OZEROV et al. [8(2): 563-570] - - BOSE et al. [9(2): 375-377] - - HRADSKÝ et al. [9(2): 379-392] - - ROTHERAY [10(1): 219–226] - - HIPPA et al. [11(2): 405-428] - - GUO et al. [11(2): 493-499] - - SHAMSHEV et al. [12(1): 109-117] - - WEIPERT et al. [12(2): 319-330] - - SHAMSHEV et al. [12(2): 331-336] - - MENZEL et al. [13(2): 209-229] - - BROWN [15(1/2): 185-187] - - GROOTAERT et al. [15(1/2): 165-174]
• Orientation HUTCHINSON [7(1): 233-240]
• Orientierung HUTCHINSON [7(1): 233-240]
• Orthocladiinae SAETHER [11(1): 193-197]
• Orthoptera HOLSTEIN et al. [1(1): 114-121] - - EBEJER [7(1): 121-124]
• Österreich WAGNER [2(1): 65-68] - - KALLWEIT [5(1): 153-157] - - GROSSMANN [5(2): 323-334] - - SKUHRAVA et al. [15(1/2): 49-150]
• Ovipostion LACHMANN et al. [7(2): 533-542] - - RIBEIRO DO AMARAL et al. [13(1): 145-148]
• Oxypodidae STARK et al. [12(1): 28, 56] - - STARK et al. [13(2): 208 + 230]
• Oyster mushrooms DISNEY et al. [11(1): 255-257]