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The Men's 100 Breaststroke swimming event at the 2009 SEA Games was held on December 11, 2009. Huu Viet Nguyen of Vietnam won the event.^[1]

Place	Swimmer	Nation	Time	Notes
1	Huu Viet Nguyen	Vietnam	1:01.60	GR
2	Indra Gunawan	Indonesia	1:01.92
3	Vorrawuti Aumpiwan	Thailand	1:02.60
4	Jia Hao Ng	Singapore	1:04.14
5	Nicko Biondi	Indonesia	1:04.51
6	Yap See Tuan	Malaysia	1:04.94
7	Mark Tan	Singapore	1:04.96
8	Nuttapong Ketin	Thailand	1:05.16

Rank	Heat	Swimmer	Nation	Time	Notes
1	H1	Indra Gunawan	Indonesia	1:02.59	Q, GR
2	H2	Huu Viet Nguyen	Vietnam	1:03.77	Q
3	H1	Jia Hao Ng	Singapore	1:04.48	Q
4	H1	Vorrawuti Aumpiwan	Thailand	1:04.57	Q
5	H2	Nicko Biondi	Indonesia	1:04.96	Q
6	H2	Yap See Tuan	Malaysia	1:05.16	Q
7	H1	Mark Tan	Singapore	1:05.32	Q
8	H2	Nuttapong Ketin	Thailand	1:05.86	Q
9	H1	Banjo Borja	Philippines	1:08.26
10	H2	Hem Thonponloeu	Cambodia	1:13.96
11	H1	A Anulack	Laos	1:19.39
12	H2	N Nilaphon	Laos	1:20.63
13	H1	Kun Narak	Cambodia	1:22.84