The 1999 AMC was held on Tuesday 3 August.

Australian and New Zealand medallists were presented with their medals at a function at Government House, Brisbane, on Wednesday 3 November by the Governor of Queensland, Major General Peter Arnison AO.

Singapore medals were presented at a function in the Australian High Commission in Singapore by the High Commissioner, the Hon Murray McLean OAM, on Thursday 21 October.

Philippine medals were presented at a function on Wednesday 21 October at Manila Midtown Hotel by the Philippines Secretary of the Department of Science and Technology, Dr Filemon A Uriarte, Jr. He was assisted by Undersecretary Dr Rufino C Lirag, Jr and the Australian Embassy was represented by Charge d'Affaires, the Hon Nicholas Coppell.

Bulgarian Medals were presented at a ceremony at the Bulgarian Academy of Sciences on 7 December 1999 by the Australian Ambassador to Bulgaria, His Excellency Mr Ross Burns, accompanied by the Australian Honorary Consul in Sofia, Mrs Indiana Trifonova. This ceremony also saw the awarding of the 1998 medals.

AMC Medallists from the Junior, Intermediate & Senior Divisions
NAME	SCHOOL		YR
BROWN Aaron	Northpine Christian College	QLD	8
CHEN Fay	Somerville House	QLD	8
CHEONG Kah Kay	Anglo-Chinese School (Independent)	SIN	8
CHUA Timothy	Xavier School	PHI	8
COLEMAN Patrick	St Peter's College	SA	7
DANG Thurston	Caringbah Selective High School	NSW	7
DY Samuel	St Stephen's High School	PHI	8
GARTON Thomas	Woodleigh School	VIC	8
HARKNESS Matthew*	St Andrew's Secondary School	SIN	8
HITCHCOCK Steven	Matamata College	NZ	8
IYER Nithin	Sydney Grammar School	NSW	7
LAI Jensen	Billanook College	VIC	8
LIN Zongheng Wilson	Raffles Institution	SIN	8
LIANG Feng-Yuan	St George Girls High School	NSW	8
MARINOV Radoslav	Varna Mathematical School	BUL	7
NERECENA Carlo	Philippine Science High School	PHI	7
NG Angus	Sydney Boys High School	NSW	8
NG Jun Siang	Raffles Institution	SIN	8
OLESEN Esper	Wauchope High School	NSW	8
PINSON Matthew	Cowra High School	NSW	7
QIN Charles	Sydney Boys High School	NSW	8
SUTANTO David	Trinity Grammar School	VIC	8
Van ZETTEN Matthew	St Patrick's College Launceston	TAS	8
ZHAO Zi Qing	Anglo-Chinese School (Independent)	SIN	8
EDWARDS Phillip	Hale School	WA	10
KWOK Andrew	University High School	VIC	9
LI Zhen	The Chinese High School	SIN	10
LIN Zhixiang*	River Valley High School	SIN	9
McNAMARA Peter*	Hale School	WA	10
ROBERTS Benjamin	Toowoomba Grammar School	QLD	10
TAN Lit Hau	James Ruse Agricultural High School	NSW	10
THAI Duc	Rostrevor College	SA	10
WANG Ziqian*	Raffles Institution	SIN	9
WHITE Gareth	Hurlstone Agricultural High School	NSW	9
WU Jie	Nanyang Girls High School	SIN	9
YEOH Daniel	Pembroke School	SA	10
CHEESEMAN Andrew	Mentone Grammar School	VIC	12
ZHECHEV Dimiter	Mathematical School of Gabrovo	BUL	11
CHU Geoffrey*	Scotch College	VIC	11
FREIBERG Tristan*	Boonah State High School	QLD	12
HANDLEY Benjamin	Logan Park High School, Dunedin	NZ	12
LIM Yin*	Victoria Junior College	SIN	11
MORRISON Matthew	Malanda State High School	QLD	12
RAMCHEN Lev	Melbourne Grammar School	VIC	11
SUN Kevin*	James Ruse Agricultural High School	NSW	12
TAPLIN Joel	Radford College	ACT	12
WENG Wenrong	Melville High School, Hamilton	NZ	12
WILSON Julian	Dubbo Distance Education Centre	NSW	12
* denotes perfect score: BH Neumann certificate

During this year Geoffrey Chu won an IMO Gold Medal in Romania. He was one point behind the top score in the world. Peter McNamara was also in Romania, winning a Bronze Medal, and he went on to become Australia's first student to win two IMO Gold Medals.