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	28
AlgeriaALG	Abdelhafid Hadjsadok - Abdallah Rahmani			1977	24
ArgentinaARG	Patricia Fauring		Visit ↗↗	1988	37	1997, 2012
ArmeniaARM	Gurgen Asatryan		Visit ↗↗	1993	33
AustraliaAUS	Mark Barnes		Visit ↗↗	1981	45	1988, 2025
AustriaAUT	Theresia Eisenkölbl		Visit ↗↗	1970	55	1976
AzerbaijanAZE	Fuad Garayev			1993	32
BahrainBAH				1990	3
BelgiumBEL	Bart Windels		Visit ↗↗	1969	47
BeninBEN	Leonard Todjihounde			2009	2
Burkina FasoBFA	Antonio Kambiré		Visit ↗↗	2014	2
BangladeshBGD	Mahbub Majumdar		Visit ↗↗	2005	21
BulgariaBGR	Emil Kolev		Visit ↗↗	1959	66	1966, 1975
Bosnia and HerzegovinaBIH	Muharem Avdispahić			1993	33
BelarusBLR	David Zmiaikou			1993	33
BermudaBMU	Kevin Minors				0
BoliviaBOL	Sonia Cordero Cárdenas		Visit ↗↗	1997	21
BrazilBRA	Edmilson Luis Rodrigues Motta		Visit ↗↗	1979	46	2017
BruneiBRU	Syed Rozman bin Haji Syed Abd Rahim			2000	1
BhutanBTN	Yeshey Lhendup			2024	2
BotswanaBWA	Mmoloki Lekhutlile		Visit ↗↗	2015	11
CanadaCAN	James Rickards		Visit ↗↗	1981	45	1995
ChileCHI	Hernan Burgos		Visit ↗↗	1994	22
People's Republic of ChinaCHN	HUANG Lei			1985	40	1990, 2026
Commonwealth of Independent StatesCIS				1992	1
Ivory CoastCIV	Adama Coulibaly			2010	8
CameroonCMR	Joseph Domguia		Visit ↗↗	2023	2
ColombiaCOL	María Falk Losada		Visit ↗↗	1981	45	2013
Costa RicaCRI	Comisión de las Olimpiadas Costarricenses de Matemáticas		Visit ↗↗	2005	21
CubaCUB	Nelson Tomás Hernandez Reyes			1971	47	1987
CyprusCYP	Gregory Makrides		Visit ↗↗	1984	41
Czech RepublicCZE	Pavel Calábek		Visit ↗↗	1993	33
CzechoslovakiaCZS				1959	33	1962, 1971, 1984
DenmarkDEN	Kirsten Rosenkilde		Visit ↗↗	1991	35
Dominican RepublicDOM	Zulaicka M. Guzmán G.			2019	5
EcuadorECU	Pablo Serrano Santos		Visit ↗↗	1988	27
EgyptEGY				2016	5
SpainESP	María Gaspar		Visit ↗↗	1983	43	2008
EstoniaEST	Oleg Košik		Visit ↗↗	1993	33
EthiopiaETH					0
FinlandFIN	Anne-Maria Ernvall-Hytönen		Visit ↗↗	1965	52	1985
FranceFRA	Vincent Jugé et Johan Yebbou		Visit ↗↗	1967	56	1983
German Democratic RepublicGDR				1959	29	1965, 1974
GeorgiaGEO	George Chelidze			1993	33
GermanyGER	Uwe Leck		Visit ↗↗	1977	48	1989, 2009
GhanaGHA	Joel M. Dogoe		Visit ↗↗	2014	12
GambiaGMB	Kolapo I. Abdul			2014	1
GuatemalaGTM	José Carlos Bonilla			1997	15
GreeceHEL	Anargyros Fellouris		Visit ↗↗	1975	47	2004
Hong KongHKG	Lander Lam			1988	38	1994, 2016
HondurasHND	Comité Hondureño de Olimpiadas Matemáticas			2008	15
CroatiaHRV	Matija Bašić		Visit ↗↗	1993	33
HungaryHUN	Viktor Harangi			1959	65	1961, 1970, 1982, 2027
IndonesiaIDN	Aleams Barra		Visit ↗↗	1988	37
IndiaIND	Prof. Prithwijit De		Visit ↗↗	1989	36	1996
IrelandIRL	Bernd Kreussler		Visit ↗↗	1988	38
Islamic Republic of IranIRN	Ali Partofard		Visit ↗↗	1985	40
IraqIRQ	Miri Tas			2016	9
IcelandISL	Marteinn Thor Harðarson		Visit ↗↗	1985	41
IsraelISR	Lev Radzivilovsky		Visit ↗↗	1979	44
ItalyITA	Massimo Gobbino		Visit ↗↗	1967	46
JamaicaJAM	Raymond McEachin			2016	1
JapanJPN	前田 吉昭		Visit ↗↗	1990	36	2003, 2023
KazakhstanKAZ	Gazhdembek Tursunov			1993	32	2010
KenyaKEN	James Kiwanuka Katende		Visit ↗↗	2016	8
KyrgyzstanKGZ	Ishmatov Makhamadkhan			1993	33
CambodiaKHM	Seam Ngonn			2007	10
Republic of KoreaKOR	Prof. Hoseog Yu		Visit ↗↗	1988	38	2000
KosovoKSV	Armend Shabani		Visit ↗↗	2011	14
KuwaitKWT	Adnan Abdulmuhsen			1982	28
LaosLAO	Sackmone Sirisack			2016	1
LebanonLBN	Marc Fares				0
LibyaLBY					0
LiechtensteinLIE	Arnaud Maret		Visit ↗↗	2005	16
Sri LankaLKA	Chanakya J. Wijeratne		Visit ↗↗	1995	30
LithuaniaLTU	Aivaras Novikas		Visit ↗↗	1993	33
LuxembourgLUX	Mike Dostert			1979	40
LatviaLVA	Maruta Avotiņa		Visit ↗↗	1993	33
MacauMAC	Ieng Tak Long			1990	34
MoroccoMAR	ASENSOUYIS Hassan			1983	42
MalaysiaMAS	M. Suhaimi Ramly		Visit ↗↗	1995	31
Republic of MoldovaMDA	Anatolie Topala			1993	33
MadagascarMDG	Fanja Rakotondrajao			2016	1
MexicoMEX	Maria Guadalupe Russell Noriega		Visit ↗↗	1981	40	2005
North MacedoniaMKD	Gjorgji Markoski		Visit ↗↗	1993	33
MyanmarMMR	HTIN AUNG			2016	8
MontenegroMNE	Tatjana Vujosevic			2007	18
MongoliaMNG	Otgonbayar Uuye		Visit ↗↗	1964	54	2029
MozambiqueMOZ	Luis de Nascimento Paulo			2004	3
MauritaniaMRT	Horma Ould HAMOUD		Visit ↗↗	2009	4
MauritiusMUS					0
NamibiaNAM	Martin Mugochi		Visit ↗↗	2025	1
Turkish Republic of Northern CyprusNCY				1993	1
NigeriaNGA	Promise Mebine		Visit ↗↗	2006	14
NicaraguaNIC	Hank de Jesús Espinoza Serrano		Visit ↗↗	1987	10
NetherlandsNLD	Quintijn Puite		Visit ↗↗	1969	55	2011
NorwayNOR	Dag Wessel-Berg		Visit ↗↗	1984	42	2022
NepalNPL	Binod Prasad Pant		Visit ↗↗	2017	9
New ZealandNZL	Kevin Shen		Visit ↗↗	1988	38
OmanOMN	Maya Al Azri			2020	5
PakistanPAK	Sarfraz Ahmad			2005	20
PanamaPAN	Pedro A. Marrone G.		Visit ↗↗	1987	17
ParaguayPAR	Gabriela Gómez Pasquali		Visit ↗↗	1997	27
PeruPER	Comisión de Olimpiadas de la Sociedad Matemática Peruana		Visit ↗↗	1987	32
PhilippinesPHI	Hazel Joy Shi		Visit ↗↗	1988	37
PolandPOL	Tomasz Cieśla		Visit ↗↗	1959	65	1963, 1972, 1986
PortugalPOR	Joana Teles		Visit ↗↗	1989	37
Puerto RicoPRI	Luis F. Cáceres		Visit ↗↗	1997	26
Democratic People's Republic of KoreaPRK	GI CHAN KIM			1990	12
PalestinePSE	Dr. Mohamed Khalil		Visit ↗↗	2022	2
QatarQAT				2025	1
RomaniaROU	Cătălin Gherghe		Visit ↗↗	1959	66	1959, 1960, 1969, 1978, 1999, 2018
Russian FederationRUS	Kirill Sukhov		Visit ↗↗	1992	30	1992, 2020, 2021
RwandaRWA	Arun Shanmuganathan		Visit ↗↗	2021	5
South AfricaSAF	Liam Baker		Visit ↗↗	1992	34	2014
Saudi ArabiaSAU	Sultan Saud Albarakati		Visit ↗↗	2004	21	2028
Serbia and MontenegroSCG				2003	3
SenegalSEN	Samba Dabo				0
SingaporeSGP	Yong Sheng Soh		Visit ↗↗	1988	38
El SalvadorSLV	Riquelmi Salvador Cardona Fuentes		Visit ↗↗	2005	20
SerbiaSRB	Miljan Knežević		Visit ↗↗	2006	20
SwitzerlandSUI	Arnaud Maret		Visit ↗↗	1991	35
SlovakiaSVK	Stanislav Krajči		Visit ↗↗	1993	33
SloveniaSVN	Gregor Dolinar		Visit ↗↗	1993	33	2006
SwedenSWE	Jana Madjarova		Visit ↗↗	1967	58	1991
SyriaSYR	Hala Al Dakkak		Visit ↗↗	2009	17
ThailandTHA	Thiradet Jiarasuksakun			1989	37	2015
TajikistanTJK	Umed Karimov			2005	21
TurkmenistanTKM	Pirmyrat Gurbanov			1993	26
Trinidad and TobagoTTO	Indra Haraksingh			1991	32
TunisiaTUN	Taoufik Charrada			1981	34
TürkiyeTUR	Azer Kerimov		Visit ↗↗	1978	42	1993
TaiwanTWN	Yen-chi Roger Lin		Visit ↗↗	1992	34	1998
TanzaniaTZA	Ertugrul Tarhan			2014	8
United Arab EmiratesUAE	Ministry of Education		Visit ↗↗	2008	8
UgandaUGA	Joseph Ssebuliba		Visit ↗↗	2012	14
UkraineUKR	Bogdan Rublov		Visit ↗↗	1993	33
United KingdomUNK	Geoff Smith		Visit ↗↗	1967	58	1979, 2002, 2019, 2024
UruguayURY	Maximiliano Stock		Visit ↗↗	1987	28
United States of AmericaUSA	Doug Ensley		Visit ↗↗	1974	51	1981, 2001
Union of Soviet Socialist RepublicsUSS				1959	29	1964, 1968, 1973
UzbekistanUZB	Science Olympiad Center		Visit ↗↗	1997	24
VenezuelaVEN	Rafael Sánchez		Visit ↗↗	1981	31
VietnamVNM	Gia Vuong Nguyen Chu			1974	49	2007
YemenYEM	Munaf Abood				0
YugoslaviaYUG				1963	37	1967, 1977
ZimbabweZWE	A Stewart			2009	2