The Geometry Prize was established in 1987. It was made possible by the donations of many mathematicians working in geometry. The Geometry Prize is awarded in recognition of results of particular significance, high quality research over a sustained period of time, or books which have been particularly influential. It encompasses geometry in a wide sense, including differential geometry, topology, and algebraic geometry. It may be awarded to groups of collaborators as well as individuals. On the basis of the above criteria, the Geometry Prize Committee considers suitable candidates and awards at most two prizes per year. In addition to the prize money, each awardee receives a bronze plaque, which was cast from the original relief by Sei-ichi Yano, and posthumously donated by Kentaro Yano. Donations to the prize fund are welcome. Please contact a member of the Mathematical Society of Japan for details.

Year	Recipients
1987	Akio Kawauchi
	Shoshichi Kobayashi
1988	Hirotaka Fujimoto
1989	Kenji Fukaya
	Yoshio Muto
1990	Akito Futaki
1991	Masaru Takeuchi
	Takashi Tsuboi
1992	Akira Fujiki
	Norihito Koiso
1993	Tomoyoshi Yoshida
1994	Ryoichi Kobayashi
	Tadashi Nagano
1995	Masaaki Umehara and Kotaro Yamada
1996	Hideki Omori
1997	Shigetoshi Bando
	Hiraku Nakajima
1998	Masahiko Kanai
	Tomotada Ohtsuki
1999	Kaoru Ono
	Takao Yamaguchi
2000	Sadayoshi Kojima
	Takeo Ohsawa
2001	Reiko Miyaoka
2002	Kazuyoshi Kiyohara
	Hajime Tsuji
2003	Kengo Hirachi
	Shigenori Matsumoto
2004	Seiichi Kamada
	Shin Nayatani
2005	Koji Fujiwara
	Ryushi Goto
2006	Toshiki Mabuchi
	Takashi Shioya
2007	Shigeyuki Morita
	Ken-Ichi Yoshikawa
2008	Kazuo Habiro
2009	Ko Honda
	Yoshikata Kida

The primary purpose of the Geometry Prize is to reward each year a mathematician who has published an outstanding paper, or who through his or her career has contributed to the advancement of geometry over a sustained period of time in various ways, including achievements related to the guidance of students. There is no age limit for award winners. Geometry will be interpreted in a wide sense, as outstanding results are being achieved beyond traditional boundaries, for example in areas related to topology, nonlinear partial differential equations in global analysis, and areas between mathematical physics and differential geometry.

The Iyanaga Prize is awarded for important work by mathematicians who are at most 40 years old, and who are expected to make further significant contributions in the future. At the same time, it is essential to recognize those whose contributions accumulate in a steady manner. By establishing the Geometry Prize it is our hope to supplement the Iyanaga Prize to honor those who contribute to the field of geometry in other ways.

The funds for this prize will come from various sources, including initial donations by a few volunteers, and further donations to the prize fund will be welcome. The Board of Trustees, representing diverse fields, will determine winners of the prize. The American Mathematical Society has various prizes as well as scholarships, and it is our hope that this prize will play a similar role in Japan. It is our pleasure that many have already unofficially supported this idea.

[General]
1.	This fund shall be called the Geometry Prize Fund.
[Purposes and Projects]
2.	The purpose of the fund is to contribute to the advancement of mathematics, in particular in the field of geometry in a broad sense.
3.	To accomplish the above purpose, the following projects shall be undertaken:
	i)	Awarding of the Geometry Prize to mathematicians who have made outstanding contributions to the advancement of geometry.
	ii)	Execution of related projects deemed appropriate.
[Geometry Prize Committee]
4.	A committee shall be set up to determine the winners of the Geometry Prize, as well as to administer effectively the fund.
5.	Each year, the committee shall comprise five to ten members recommended by the committee for the previous year, and one member recommended by the board of directors of the Mathematical Society of Japan. A committee chair shall be elected by vote of the committee.
6.	The term of a committee member shall be one year, renewable if appropriate.
[Awarding the Geometry Prize]
7.	Each year the committee shall determine one or two winners of the Geometry Prize, and the committee chair shall award the prize.
8.	Each winner shall be granted a certificate of commendation and prize money, presently three hundred thousand yen, at the annual award ceremony. Names and achievements of winners shall be widely publicized.
[Council]
9.	The committee chair shall call for committee meetings as needed.
10.	In addition to the issues specified above, the following matters may be discussed:
	i)	The dissolution or modification of the funding operation or of the articles stated herein.
	ii)	Other issues related to the operation of this fund.
[Assets and Accounting]
11.	The initial assets of the fund comprise one million yen received from voluntary contributions. Further contributions to the fund can be accepted at any time. Donations shall be managed by the Mathematical Society of Japan in accordance with bylaw 48 of the articles of the Mathematical Society of Japan.
[Amendments]
1.	These rules are effective from February 7 of 1987.
2.	From 1994, a supplementary prize (a bronze plaque, forty copies of which were cast from the original relief by Sei-ichi Yano, and donated posthumously by Kentaro Yano) is awarded to each winner, and also to winners prior to 1994.
3.	Awarding the Geometry Prize to a group of researchers in recognition of joint work is possible from 1995. In such a case the prize money is to be evenly divided among the researchers in each winning group, while the award certificate and the supplementary prize are conferred upon each researcher.