Natsumi Hamamura (浜村 夏美, Hanamura Natsumi, born 29 June 1984) is a Japanese former professional tennis player.

Hamamura has a career-high singles ranking of world No. 203, achieved on 25 February 2008. On 20 August 2007, she peaked at No. 194 in the WTA doubles rankings. In her career, she won three singles titles and nine doubles titles on the ITF Women's Circuit.

Hamamura made her WTA Tour main-draw debut at the 2010 Japan Women's Open, in the doubles event partnering Miki Miyamura.

Outcome	No.	Date	Location	Surface	Opponent	Score
Winner	1.	7 November 2004	Sutama, Japan	Clay	Florence Haring	3–6, 6–3, 7–5
Runner-up	1.	5 February 2006	Taupō, New Zealand	Hard	Leanne Baker	1–6, 2–6
Runner-up	2.	21 May 2007	Nagano, Japan	Carpet	Rika Fujiwara	5–7, 2–6
Runner-up	3.	3 June 2007	Gunma, Japan	Carpet	Kumiko Iijima	6–3, 3–6, 6–7(3–7)
Winner	2.	3 May 2010	Bundaberg, Australia	Hard	Sally Peers	6–0, 6–4
Winner	3.	23 May 2010	Karuizawa, Japan	Clay	Xu Yifan	6–1, 6–2

Outcome	No.	Date	Tournament	Surface	Partner	Opponents	Score
Winner	1.	10 September 2006	Kyoto, Japan	Carpet	Ayaka Maekawa	Maki Arai Yukiko Yabe	6–4, 6–2
Runner-up	1.	23 September 2006	Ibaraki, Japan	Hard	Ayaka Maekawa	Kumiko Iijima Junri Namigata	7–6(7–4), 3–6, 2–6
Runner-up	2.	16 February 2007	Melbourne, Australia	Clay	Ayumi Morita	Hwang I-hsuan Lee Ye-ra	2–6, 1–6
Winner	2.	6 May 2007	Chengdu, China	Hard	Song Shanshan	Chen Yanchong Liu Wanting	7–5, 4–6, 6–2
Winner	3.	27 May 2007	Nagano, Japan	Carpet	Ayaka Maekawa	Mari Tanaka Akiko Yonemura	7–6(7–2), 6–3
Runner-up	3.	19 June 2007	Noto, Japan	Carpet	Mari Tanaka	Anne Yelsey Sophie Ferguson	6–7(8–10), 1–6
Runner-up	4.	10 July 2007	Miyazaki, Japan	Carpet	Ayaka Maekawa	Zhang Shuai Zhao Yijing	4–6, 4–6
Runner-up	5.	22 September 2007	Tsukuba, Japan	Hard	Ayaka Maekawa	Ayumi Oka Tomoko Sugano	2–6, 3–6
Runner-up	6.	10 March 2008	Kalgoorlie, Australia	Hard	Remi Tezuka	Li Ting Zhou Yimiao	1–6, 6–4, [8–10]
Winner	4.	23 June 2008	Qianshan, China	Hard	Remi Tezuka	Yuka Kuroda Tomoko Sugano	6–4, 6–0
Winner	5.	19 October 2008	Makinohara, Japan	Carpet	Junri Namigata	Chae Kyung-yee Han Xinyun	7–5, 7–6(7–4)
Winner	6.	2 August 2009	Obihiro, Japan	Carpet	Ayumi Oka	Rika Fujiwara Kurumi Nara	3–6, 6–1, [10–5]
Winner	7.	4 February 2011	Burnie International, Australia	Hard	Erika Takao	Olivia Rogowska Sally Peers	6–2, 3–6, [10–7]
Runner-up	7.	22 May 2011	Karuizawa, Japan	Carpet (i)	Ayumi Oka	Rika Fujiwara Shuko Aoyama	4–6, 4–6
Winner	8.	24 May 2011	Niigata, Japan	Hard	Erika Sema	Akari Inoue Ayumi Oka	6–1, 6–2
Runner-up	8.	19 June 2011	Balikpapan, Indonesia	Hard	Yurika Sema	Kanae Hisami Varatchaya Wongteanchai	3–6, 2–6
Runner-up	9.	11 September 2011	Noto, Japan	Carpet	Ayumi Oka	Kanae Hisami Varatchaya Wongteanchai	6–1, 6–7(4–7), [12–14]
Winner	9.	30 October 2011	Hamanako, Japan	Carpet	Ayumi Oka	Huỳnh Phương Đài Trang Varatchaya Wongteanchai	6–3, 6–3

• Natsumi Hamamura at the Women's Tennis Association
• Natsumi Hamamura at the International Tennis Federation