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	Budapest	July 16 - 26
67	2026	People's Republic of ChinaCHN	Shanghai	July 10 - 21	117	666	(76 ♀)
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	Taipei	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 ♀)