| 2025 | Virtual | A. Vassilevski | No proceedings. | European ECR |
| 2018 | Yerevan, Armenia | N.Ayvazyan | No proceedings | European Section |
| 2011 | Valencia, Spain | J.Calvete | No proceedings | European Section |
| 2008 | Leuven, Belgium | J.Tytgat | No proceedings | European Section |
| 2004 | Kranj, Slovenia | F.Gubensek & I.Krizaj | No proceedings | European Section |
| 2001 | Stockholm, Sweden | H. Persson | No proceedings | European Section |
| 1998 | London, UK | D.Theakston | No proceedings | European Section |
| 1996 | Basel, Switzerland | J.Meier | Abstracts published in Toxicon 1997. | European Section |
| 1993 | Arezzo, Italy | A.Grasso | Abstracts published in Toxicon 32, 381-410, 1994. | European Section |
| 1992 | Paris, France | P.Boquet, A.Menez, J.Pusset | Abstracts published in Toxicon 31, 497-540, 1993. | European Section |
| 1990 | Lohusalu, Estonia | J.Siigur | Abstracts published in Toxicon 29, 279-299, 1991. | European Section |
| 1989 | Porec, Yugoslavia | F.Gubensek | Abstracts published in Toxicon 28, 141-170, 1990. | European Section |
| 1986 | Prague, Czechoslovakia | F.Kornalik, H.Raskova, K.Masek | Proc. of the 6th Eur.Symp. on Animal, Plant and Microbial Toxins (F.Kornalik and D.Mebs, eds.), publ. by the European Section, Prague, 1986. | European Section |
| 1984 | Basel, Switzerland | K.Stocker, T.A.Freyvogel, J.Meier | Proc. of the 6th Eur.Symp. on Animal, Plant and Microbial Toxins (J.Meier, K.Stocker, T.A.Freyvogel, eds.), publ. by the European Section, Basel, 1984. | European Section |
| 1983 | Hannover, Germany | G.G.Habermehl and D.Mebs | Proc. of the 5th Eur.Symp. on Animal, Plant and Microbial Toxins (D.Mebs and G.G.Habermehl, eds.), publ. by the European Section, Hannover, 1983. | European Section |
| 1981 | Marseille, France | H.Rochat | Toxicon 20, no.1, 1982. | European Section |
| 1978 | London, England | B.E.C.Banks | 3rd Symposium on Plant, Animal and Microbial Toxins (G.Habermehl and D.Mebs, eds.), THD Schriftenreihe Wissenschaft und Technik 14, 1979. | European Section |
| 1977 | Portoroz, Yugoslavia | F.Gubensek | Period.Biol. suppl.1, 1978 | European Section |
| 1975 | Paris, France | P.Boquet | Venins et Toxins d´Origine Animale, Vegetale et Microbienne | European Section |
| 2023 | Brasilia, DF, Brazil | M.Castro | No proceedings | Pan American Section |
| 2016 | Miami Beach, FL, USA | F.Mari & F.Bosmans | No proceedings | Pan American Section |
| 2013 | Guaruja, SP, Brazil | D.V.Tambourgi | No proceedings | Pan American Section |
| 2010 | San Jose, Costa Rica | J.M.Gutierrez | No proceedings | Pan American Section |
| 2007 | Juriquilla, Queretaro, Mexico | A.C. Alagon | No proceedings | Pan American Section |
| 2004 | Angra dos Reis, RJ, Brazil | J.Perales | No proceedings | Pan American Section |
| 2002 | Charlottsville, Virginia, USA | J.Fox | No proceedings | Pan American Section |
| 1998 | Porlamar, Margarita Island, Venezuela | C.Sevcik | No proceedings | Pan American Section |
| 1995 | Frederick, MD, USA | K.A.Mereish and R.W.Wannemacher | Toxicon 34, 1219-1458, 1996. | Pan American Section |
| 1992 | Campinas, SP, Brazil | J.Prado-Franceschi | Abstracts published in Toxicon 31, 97-179, 1993. | Pan American Section |
| 1990 | Oaxtepec, Morelos, Mexico | L.Possani | Abstracts published in Toxicon 28, 597-630, 1990. | Pan American Section |
| 1986 | Scottsdale, AZ, USA | A.L.Bieber | Proc. of the 2nd American Symp. on Animal, Plant and Microbial Toxins (A.L.Bieber, ed.) published by the American Section, Tempe, 1986. | Pan American Section |
| 1984 | Stillwater, OK, USA | C.L.Ownby, G.Odell, L.Rolf, G.Burrows | Abstracts published in Toxicon 23, 17-41, 1985. | Pan American Section |
| 2021 | Cairns, Australia | N.Daly, J. Seymour | No proceedings | Asia Pacific Section |
| 2014 | Changsha, China | S.Liang, S.Luo, Y.Zhang, Z.Liu | No proceedings | Asia Pacific Section |
| 2011 | Vladivostok, Russia | E.Grishin & V.Stonik | No proceedings | Asia Pacific Section |
| 2008 | Hanoi & Halong Bay | T.X.Kiem & L.V.Dong | No proceedings | Asia Pacific Section |
| 2005 | Cebu City, Philippines | L.J.Cruz & R.V.Azanza | No proceedings | Asia Pacific Section |
| 2002 | Cairns, Australia | R.Norton | No proceedings | Asia Pacific Section |
| 1999 | Pattaya, Thailand | V.Sitprija | No proceedings | Asia Pacific Section |
| 1996 | Kunming, Yunnan, China | Y.Xiong | No proceedings | Asia Pacific Section |
| 1993 | Kuala Lumpur, Malaysia | N.H.Tan | Advances in Venom and Toxin Research (N.H.Tan, S.L.Oo, V.Thambyrajah, N.Azila, eds.), published by the Malayan Society on Toxinology, Kuala Lumpur 1993. | Asia Pacific Section |
| 1990 | Varanasi, India | S.C.Sanyal | No proceedings | Asia Pacific Section |
| 1987 | Singapore, Singapore | P.Gopalakrishnakone | Progress in Venom and Toxin Research (P.Gopalakrishnakone, C.K.Tan, eds.), Nat.Univ. of Singapore, 1987. | Asia Pacific Section |
| 2024 | Singapore, Singapore | K.R.Manjunatha | No proceedings | World Congress |
| 2022 | Abu Dhabi, the United Arab Emirates | T.Mohamed | No proceedings | World Congress |
| 2019 | Buenos Aires, Argentina | J.Fox, A.de Roodt, S.Bustillo | No proceedings | World Congress |
| 2017 | Hainan, China | S.Luo | No proceedings | World Congress |
| 2015 | Oxford, UK | D.Warrell, E.Rowan, M.Sohail | No proceedings | World Congress |
| 2012 | Hawaii, USA | C.Vogel & S.Seifert | No proceedings | World Congress |
| 2009 | Recife, Brazil | M.E.deLima, C.R.Ribeiro.da Silva Carlini & colleagues | No proceedings | World Congress |
| 2006 | Glasgow, UK | A.Harvey & E.G.Rowan | No proceedings | World Congress |
| 2003 | Adelaide, Australia | J.White & V.Williams | No proceedings | World Congress |
| 2000 | Paris, France | A.Menez | No proceedings | World Congress |
| 1997 | Cuernavaca, Mexico | L.Possani | No proceedings | World Congress |
| 1994 | Tel-Aviv, Israel | E.Kochva | Abstracts published in Toxicon 33, 257-306, 1995 | World Congress |
| 1991 | Singapore, Singapore | P.Gopalakrishnakone | Recent Advances in Toxinology Research, (P.Gopalakrishnakone and C.K.Tan, eds.), 3. vol., Nat.Univ.Singapore, Singapore, 1992. | World Congress |
| 1988 | Stillwater, OK, USA | C.L.Ownby, G.V.Odell, L.L.Rolf, G.E.Burrows | Natural Toxins (C.L.Ownby and G.V.Odell, eds.) Pergamon Press, Oxford, 1989. | World Congress |
| 1985 | Newcastle upon Tyne, United Kingdom | D.S.Chapman and J.B.Harris | Natural Toxins. Animal, Plant, and Microbial (J.B.Harris, ed.) Clarendon Press, Oxford, 1986. | World Congress |
| 1982 | Brisbane, Australia | R.Endean and A.Cameron | Toxicon, suppl.3, 1983. | World Congress |
| 1979 | Uppsala, Sweden | B.Uvnäs and D.Eaker | Natural Toxins (D.Eaker and T.Wadström, eds.) Pergamon Press, Oxford, 1980. | World Congress |
| 1976 | San José, Costa Rica | R.Bolanos | Toxins: Animal, Plant and Microbial, (P.Rosenberg, ed.), Pergamon Press, Oxford, 1978. | World Congress |
| 1974 | Tokyo, Japan | Y.Sawai and A.Ohsaka | Animal, Plant and Microbial Toxins (A.Ohsaka, K.Hayashi and Y.Sawai, eds.), 2 vol., Plenum Press, New York, 1976. | World Congress |
| 1972 | Darmstadt, Germany | G.G.Habermehl | Tier- und Pflanzengifte (E.Kaiser, ed.), W.Goldmann Verl., München, 1973. | World Congress |
| 1970 | Tel-Aviv, Israel | A.de Vries and E.Kochva | Toxins of Animal and Plant Origin (A.de Vries and E.Kochva, eds.), 3 vol., Gordon and Breach, New York, 1971. | World Congress |
| 1966 | Atlantic City, NJ, USA | F.E.Russell and P.R.Saunders | No proceedings | World Congress |