Countries

Over 100 countries participate in the International Mathematical Olympiad each year.

CountryCtry	Official ContactContact	Email@	National MO SiteSite	First Participation	No. of Participations	IMO Host Years
AfghanistanAFG	Onder Akkusci				0
AngolaAGO	Gabriel Boaventura			2019	1
AlbaniaALB	Adrian Naço		Visit ↗↗	1993	29
AlgeriaALG	Abdallah Rahmani			1977	25
ArgentinaARG	Patricia Fauring		Visit ↗↗	1988	38	1997, 2012
ArmeniaARM	Grigor Keropyan		Visit ↗↗	1993	34
AustraliaAUS	Mark Barnes		Visit ↗↗	1981	46	1988, 2025
AustriaAUT	Theresia Eisenkölbl		Visit ↗↗	1970	56	1976
AzerbaijanAZE	Fuad Garayev			1993	33
BahrainBAH				1990	3
BelgiumBEL	Bart Windels		Visit ↗↗	1969	48
BeninBEN	Leonard Todjihounde			2009	2
Burkina FasoBFA	Antonio Kambiré		Visit ↗↗	2014	2
BangladeshBGD	Mahbub Majumdar		Visit ↗↗	2005	22
BulgariaBGR	Emil Kolev		Visit ↗↗	1959	67	1966, 1975
Bosnia and HerzegovinaBIH	Muharem Avdispahić			1993	34
BelarusBLR	David Zmiaikou			1993	34
BermudaBMU	Kevin Minors		Visit ↗↗		0
BoliviaBOL	Sonia Cordero Cárdenas		Visit ↗↗	1997	22
BrazilBRA	Edmilson Luis Rodrigues Motta		Visit ↗↗	1979	47	2017
BruneiBRU	Syed Rozman bin Haji Syed Abd Rahim			2000	1
BhutanBTN	Yeshey Lhendup			2024	3
BotswanaBWA	Mmoloki Lekhutlile		Visit ↗↗	2015	12
CanadaCAN	James Rickards		Visit ↗↗	1981	46	1995
ChileCHI	Hernan Burgos		Visit ↗↗	1994	23
People's Republic of ChinaCHN	HUANG Lei			1985	41	1990, 2026
Commonwealth of Independent StatesCIS				1992	1
Ivory CoastCIV	Adama Coulibaly			2010	9
CameroonCMR	Joseph Domguia		Visit ↗↗	2023	3
ColombiaCOL	María Falk Losada		Visit ↗↗	1981	46	2013
Costa RicaCRI	Comisión de las Olimpiadas Costarricenses de Matemáticas		Visit ↗↗	2005	22
CubaCUB	Nelson Tomás Hernandez Reyes			1971	48	1987
CyprusCYP	Gregory Makrides		Visit ↗↗	1984	42
Czech RepublicCZE	Pavel Calábek		Visit ↗↗	1993	34
CzechoslovakiaCZS				1959	33	1962, 1971, 1984
DenmarkDEN	Kirsten Rosenkilde		Visit ↗↗	1991	36
Dominican RepublicDOM	Zulaicka M. Guzmán G.			2019	6
EcuadorECU	Pablo Serrano Santos		Visit ↗↗	1988	28
EgyptEGY	Saeed Youssef			2016	5
SpainESP	María Gaspar		Visit ↗↗	1983	44	2008
EstoniaEST	Oleg Košik		Visit ↗↗	1993	34
EthiopiaETH	Abdu Mohammed Seid				0
FinlandFIN	Anne-Maria Ernvall-Hytönen		Visit ↗↗	1965	53	1985
FranceFRA	Vincent Jugé et Johan Yebbou		Visit ↗↗	1967	57	1983
German Democratic RepublicGDR				1959	29	1965, 1974
GeorgiaGEO	George Chelidze			1993	34
GermanyGER	Uwe Leck		Visit ↗↗	1977	49	1989, 2009
GhanaGHA	Joel M. Dogoe			2014	13
GambiaGMB	Kolapo I. Abdul			2014	1
GuatemalaGTM	José Carlos Bonilla			1997	15
GreeceHEL	Anargyros Fellouris		Visit ↗↗	1975	48	2004
Hong KongHKG	Lander Lam			1988	39	1994, 2016
HondurasHND	Comité Hondureño de Olimpiadas Matemáticas			2008	16
CroatiaHRV	Matija Bašić		Visit ↗↗	1993	34
HungaryHUN	Géza Kós			1959	66	1961, 1970, 1982, 2027
IndonesiaIDN	Aleams Barra		Visit ↗↗	1988	38
IndiaIND	Prithwijit De		Visit ↗↗	1989	37	1996
IrelandIRL	Mark Flanagan		Visit ↗↗	1988	39
Islamic Republic of IranIRN	Seyed Hessam Firouzi		Visit ↗↗	1985	41
IraqIRQ	Miri Tas			2016	10
IcelandISL	Marteinn Thor Harðarson		Visit ↗↗	1985	42
IsraelISR	Lev Radzivilovsky		Visit ↗↗	1979	45
ItalyITA	Massimo Gobbino		Visit ↗↗	1967	47
JamaicaJAM	Raymond McEachin			2016	1
JapanJPN	前田 吉昭		Visit ↗↗	1990	37	2003, 2023
KazakhstanKAZ	Gazhdembek Tursunov			1993	33	2010
KenyaKEN	James Kiwanuka Katende		Visit ↗↗	2016	9
KyrgyzstanKGZ	Ishmatov Makhamadkhan			1993	34
CambodiaKHM	Seam Ngonn			2007	11
Republic of KoreaKOR	Prof. Hoseog Yu		Visit ↗↗	1988	39	2000
KosovoKSV	Armend Shabani		Visit ↗↗	2011	15
KuwaitKWT	Mohammad Al-Baqshi			1982	28
LaosLAO	Sackmone Sirisack			2016	1
LebanonLBN	Marc Fares				0
LibyaLBY	Moied Baleg			2026	1
LiechtensteinLIE	Arnaud Maret		Visit ↗↗	2005	16
Sri LankaLKA	Chanakya J. Wijeratne		Visit ↗↗	1995	31
LithuaniaLTU	Aivaras Novikas		Visit ↗↗	1993	34
LuxembourgLUX	Mike Dostert			1979	41
LatviaLVA	Kristīne Akopjana		Visit ↗↗	1993	34
MacauMAC	Ieng Tak Long			1990	35
MoroccoMAR	ASENSOUYIS Hassan			1983	43
MalaysiaMAS	M. Suhaimi Ramly		Visit ↗↗	1995	32
Republic of MoldovaMDA	Anatolie Topala			1993	34
MadagascarMDG	Fanja Rakotondrajao			2016	1
MexicoMEX	Maria Guadalupe Russell Noriega		Visit ↗↗	1981	41	2005
North MacedoniaMKD	Gjorgji Markoski		Visit ↗↗	1993	34
MyanmarMMR	HTIN AUNG			2016	9
MontenegroMNE	Tatjana Vujosevic			2007	19
MongoliaMNG	Otgonbayar Uuye		Visit ↗↗	1964	55	2029
MozambiqueMOZ	Luis de Nascimento Paulo			2004	3
MauritaniaMRT	Horma Ould HAMOUD		Visit ↗↗	2009	4
MauritiusMUS					0
NamibiaNAM	Martin Mugochi		Visit ↗↗	2025	2
Turkish Republic of Northern CyprusNCY				1993	1
NigeriaNGA	Benjamin Oyediran Oyelami			2006	14
NicaraguaNIC	Hank de Jesús Espinoza Serrano		Visit ↗↗	1987	10
NetherlandsNLD	Quintijn Puite		Visit ↗↗	1969	56	2011
NorwayNOR	Dag Wessel-Berg		Visit ↗↗	1984	43	2022
NepalNPL	Binod Prasad Pant		Visit ↗↗	2017	10
New ZealandNZL	Kevin Shen		Visit ↗↗	1988	39
OmanOMN	Zakiya Alajm			2020	6
PakistanPAK	Sarfraz Ahmad			2005	21
PanamaPAN	Pedro A. Marrone G.		Visit ↗↗	1987	18
ParaguayPAR	Joel Prieto		Visit ↗↗	1997	28
PeruPER	Comisión de Olimpiadas de la Sociedad Matemática Peruana		Visit ↗↗	1987	33
PhilippinesPHI	Richard Eden		Visit ↗↗	1988	38
PolandPOL	Tomasz Cieśla		Visit ↗↗	1959	66	1963, 1972, 1986
PortugalPOR	Joana Teles		Visit ↗↗	1989	38
Puerto RicoPRI	Luis F. Cáceres		Visit ↗↗	1997	27
Democratic People's Republic of KoreaPRK	Ri Kyong Ho			1990	13
PalestinePSE	Dr. Mohamed Khalil		Visit ↗↗	2022	3
QatarQAT				2025	2
RomaniaROU	Cătălin Gherghe		Visit ↗↗	1959	67	1959, 1960, 1969, 1978, 1999, 2018
Russian FederationRUS	Kirill Sukhov		Visit ↗↗	1992	31	1992, 2020, 2021
RwandaRWA	Obed Nsanzimfura Korusenge		Visit ↗↗	2021	6
South AfricaSAF	Liam Baker		Visit ↗↗	1992	35	2014
Saudi ArabiaSAU	Sultan Saud Albarakati		Visit ↗↗	2004	22	2028
Serbia and MontenegroSCG				2003	3
SenegalSEN	Samba Dabo			2026	1
SingaporeSGP	Yong Sheng Soh		Visit ↗↗	1988	39
El SalvadorSLV	Riquelmi Salvador Cardona Fuentes		Visit ↗↗	2005	21
SerbiaSRB	Miljan Knežević		Visit ↗↗	2006	21
SwitzerlandSUI	Swiss Mathematical Olympiad Board		Visit ↗↗	1991	36
SlovakiaSVK	Stanislav Krajči		Visit ↗↗	1993	34
SloveniaSVN	Gregor Dolinar		Visit ↗↗	1993	34	2006
SwedenSWE	Jana Madjarova		Visit ↗↗	1967	59	1991
SyriaSYR	Chadi Al-Azmeh		Visit ↗↗	2009	18
ThailandTHA	Thiradet Jiarasuksakun			1989	38	2015
TajikistanTJK	Umed Karimov			2005	22
TurkmenistanTKM	Pirmyrat Gurbanov		Visit ↗↗	1993	27
Trinidad and TobagoTTO	Indra Haraksingh			1991	32
TunisiaTUN	Taoufik Charrada			1981	35
TürkiyeTUR	Azer Kerimov		Visit ↗↗	1978	43	1993
TaiwanTWN	Yen-chi Roger Lin		Visit ↗↗	1992	35	1998
TanzaniaTZA	Said Sima			2014	9
United Arab EmiratesUAE	International Olympiad Foundation		Visit ↗↗	2008	9
UgandaUGA	Joseph Ssebuliba		Visit ↗↗	2012	15
UkraineUKR	Bogdan Rublov		Visit ↗↗	1993	34
United KingdomUNK	Geoff Smith		Visit ↗↗	1967	59	1979, 2002, 2019, 2024
UruguayURY	Maximiliano Stock		Visit ↗↗	1987	29
United States of AmericaUSA	Karen Bliss		Visit ↗↗	1974	52	1981, 2001
Union of Soviet Socialist RepublicsUSS				1959	29	1964, 1968, 1973
UzbekistanUZB	Science Olympiad Center		Visit ↗↗	1997	25
VenezuelaVEN	Rafael Sánchez		Visit ↗↗	1981	32
VietnamVNM	Gia Vuong Nguyen Chu			1974	50	2007
YemenYEM	Munaf Abood				0
YugoslaviaYUG				1963	37	1967, 1977
ZimbabweZWE	A Stewart			2009	2