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The Men's 100 Backstroke swimming event at the 2009 SEA Games was held on December 12, 2009. Glenn Sutanto of Indonesia won the event.^[1]

Place	Swimmer	Nation	Time	Notes
1	Glenn Sutanto	Indonesia	56.42
2	Rainer Ng	Singapore	56.73
3	Zach Ong	Singapore	56.89
4	Charles Walker	Philippines	57.43
5	Guntur Pratama	Indonesia	57.58
6	Huy Long Do	Vietnam	58.07
7	Ian James Barr	Malaysia	58.28
8	Puttiping H.	Thailand	59.09

Rank	Heat	Swimmer	Nation	Time	Notes
1	H1	Charles Walker	Philippines	59.31	Q
2	H2	Ian James Barr	Malaysia	59.51	Q
3	H2	Rainer Ng	Singapore	59.72	Q
4	H2	Puttiping H.	Thailand	1:00.27	Q
5	H1	Glenn Sutanto	Indonesia	1:00.50	Q
6	H2	Zach Ong	Singapore	1:00.55	Q
7	H2	Guntur Pratama	Indonesia	1:00.76	Q
8	H2	Huy Long Do	Vietnam	1:01.18	Q
9	H1	Melvin Chua	Malaysia	1:01.82
10	H1	Radomyos Matjiur	Thailand	1:03.01
11	H1	Ryan Arabejo	Philippines	1:07.14
12	H1	N. Nilaphon	Laos	1:18.49
13	H2	S. Saylom	Laos	1:21.59