Editions

The International Mathematical Olympiad has been held annually since 1959, with the exception of 1980.

#	Year	CountryCtry	City	Period	Countries	Contestants
70	2029	MongoliaMNG	Ulaanbaatar	TBA
69	2028	Saudi ArabiaSAU	TBA	TBA
68	2027	HungaryHUN	TBA	TBA
67	2026	People's Republic of ChinaCHN	Shanghai	July 10 - 21
66	2025	AustraliaAUS	Sunshine Coast	July 10 - 20	110	630	(69 ♀)
65	2024	United KingdomUNK	Bath	July 11 - 22	108	609	(81 ♀)
64	2023	JapanJPN	Chiba	July 2 - 13	112	618	(67 ♀)
63	2022	NorwayNOR	Oslo	July 6 - 16	104	589	(68 ♀)
62	2021	Russian FederationRUS	A distributed IMO administered from St Petersburg	July 14 - 24	107	619	(64 ♀)
61	2020	Russian FederationRUS	A distributed IMO administered from St Petersburg	September 19 - 28	105	616	(56 ♀)
60	2019	United KingdomUNK	Bath	July 11 - 22	112	621	(65 ♀)
59	2018	RomaniaROU	Cluj-Napoca	July 3 - 14	107	594	(59 ♀)
58	2017	BrazilBRA	Rio de Janeiro	July 12 - 23	111	615	(62 ♀)
57	2016	Hong KongHKG	Hong Kong	July 6 - 16	109	602	(71 ♀)
56	2015	ThailandTHA	Chiang Mai	July 4 - 16	104	577	(52 ♀)
55	2014	South AfricaSAF	Cape Town	July 3 - 13	101	560	(56 ♀)
54	2013	ColombiaCOL	Santa Marta	July 18 - 28	97	527	(52 ♀)
53	2012	ArgentinaARG	Mar del Plata	July 4 - 16	100	547	(51 ♀)
52	2011	NetherlandsNLD	Amsterdam	July 12 - 24	101	563	(57 ♀)
51	2010	KazakhstanKAZ	Astana	July 2 - 14	95	516	(47 ♀)
50	2009	GermanyGER	Bremen	July 10 - 22	104	565	(59 ♀)
49	2008	SpainESP	Madrid	July 10 - 22	97	535	(55 ♀)
48	2007	VietnamVNM	Hanoi	July 19 - 31	93	520	(49 ♀)
47	2006	SloveniaSVN	Ljubljana	July 6 - 18	90	498	(38 ♀)
46	2005	MexicoMEX	Mérida	July 8 - 19	91	513	(43 ♀)
45	2004	GreeceHEL	Athens	July 6 - 18	85	486	(37 ♀)
44	2003	JapanJPN	Tokyo	July 7 - 19	82	457	(29 ♀)
43	2002	United KingdomUNK	Glasgow	July 19 - 30	84	479	(37 ♀)
42	2001	United States of AmericaUSA	Washington	July 1 - 14	83	473	(33 ♀)
41	2000	Republic of KoreaKOR	Taejon	July 13 - 25	82	461	(31 ♀)
40	1999	RomaniaROU	Bucharest	July 10 - 22	81	450	(37 ♀)
39	1998	TaiwanTWN	Taipeh	July 10 - 21	76	419	(30 ♀)
38	1997	ArgentinaARG	Mar del Plata	July 18 - 31	82	460	(28 ♀)
37	1996	IndiaIND	Mumbai	July 5 - 17	75	424	(25 ♀)
36	1995	CanadaCAN	Toronto	July 13 - 25	73	412	(27 ♀)
35	1994	Hong KongHKG	Hong Kong	July 8 - 20	69	385	(26 ♀)
34	1993	TürkiyeTUR	Istanbul	July 13 - 24	73	413	(34 ♀)
33	1992	Russian FederationRUS	Moscow	July 10 - 21	64	351	(14 ♀)
32	1991	SwedenSWE	Sigtuna	July 12 - 23	55	312	(17 ♀)
31	1990	People's Republic of ChinaCHN	Beijing	July 8 - 19	54	308	(12 ♀)
30	1989	GermanyGER	Braunschweig	July 13 - 24	50	291	(13 ♀)
29	1988	AustraliaAUS	Canberra	July 9 - 21	49	268	(17 ♀)
28	1987	CubaCUB	Havanna	July 5 - 16	42	237	(7 ♀)
27	1986	PolandPOL	Warsaw	July 4 - 15	37	210	(7 ♀)
26	1985	FinlandFIN	Joutsa	June 29 - July 11	38	209	(7 ♀)
25	1984	CzechoslovakiaCZS	Prague	June 29 - July 10	34	192	(3 ♀)
24	1983	FranceFRA	Paris	July 1 - 12	32	186	(8 ♀)
23	1982	HungaryHUN	Budapest	July 5 - 14	30	119	(3 ♀)
22	1981	United States of AmericaUSA	Washington	July 8 - 20	27	185	(9 ♀)
21	1979	United KingdomUNK	London	June 30 - July 9	23	166	(1 ♀)
20	1978	RomaniaROU	Bucharest	July 3 - 10	17	132	(3 ♀)
19	1977	YugoslaviaYUG	Belgrade	July 1 - 13	21	155	(2 ♀)
18	1976	AustriaAUT	Lienz	July 7 - 21	18	139	(4 ♀)
17	1975	BulgariaBGR	Burgas	July 3 - 16	17	135	(2 ♀)
16	1974	German Democratic RepublicGDR	Erfurt	July 4 - 17	18	140	(2 ♀)
15	1973	Union of Soviet Socialist RepublicsUSS	Moscow	July 5 - 16	16	125	(2 ♀)
14	1972	PolandPOL	Toruń	July 5 - 17	14	107	(2 ♀)
13	1971	CzechoslovakiaCZS	Žilina	July 10 - 21	15	115	(4 ♀)
12	1970	HungaryHUN	Keszthely	July 8 - 22	14	112	(5 ♀)
11	1969	RomaniaROU	Bucharest	July 5 - 20	14	112	(6 ♀)
10	1968	Union of Soviet Socialist RepublicsUSS	Moscow	July 5 - 18	12	96
9	1967	YugoslaviaYUG	Cetinje	July 2 - 13	13	99	(1 ♀)
8	1966	BulgariaBGR	Sofia	July 1 - 14	9	72	(1 ♀)
7	1965	German Democratic RepublicGDR	Berlin	July 3 - 13	10	80	(9 ♀)
6	1964	Union of Soviet Socialist RepublicsUSS	Moscow	June 30 - July 10	9	72	(4 ♀)
5	1963	PolandPOL	Wrocław	July 5 - 13	8	64	(2 ♀)
4	1962	CzechoslovakiaCZS	České Budějovice	July 7 - 15	7	56	(4 ♀)
3	1961	HungaryHUN	Veszprém	July 6 - 16	6	48	(5 ♀)
2	1960	RomaniaROU	Sinaia	July 18 - 26	5	39	(1 ♀)
1	1959	RomaniaROU	Braşov	July 21 - 31	7	52	(6 ♀)