Bob and Mike Bryan defeated Max Mirnyi and Andy Ram in the final, 7–6^(7–5), 6–3 to win the doubles tennis title at the 2009 ATP World Tour Finals. It was their third Tour Finals title.

Daniel Nestor and Nenad Zimonjić were the defending champions, but were eliminated in the round-robin stage.

	Semifinals							Final
	3	Mahesh Bhupathi Mark Knowles	4	4
	2	Bob Bryan Mike Bryan	6	6
								2	Bob Bryan Mike Bryan	77	6
								7	Max Mirnyi Andy Ram	65	3
	7	Max Mirnyi Andy Ram	6	77
	5	František Čermák Michal Mertiňák	4	64

		Nestor Zimonjić	Bhupathi Knowles	Čermák Mertiňák	Fyrstenberg Matkowski	RR W–L	Set W–L	Game W–L	Standings
1	Daniel Nestor Nenad Zimonjić		6–4, 7–6(11–9)	3–6, 4–6	4–6, 4–6	1–2	2–4	28–34	4
3	Mahesh Bhupathi Mark Knowles	4–6, 6–7(9–11)		6–3, 6–3	3–6, 6–3, [10–7]	2–1	4–3	32–28	1
5	František Čermák Michal Mertiňák	6–3, 6–4	3–6, 3–6		6–4, 6–4	2–1	4–2	30–27	2
8	Mariusz Fyrstenberg Marcin Matkowski	6–4, 6–4	6–3, 3–6, [7–10]	4–6, 4–6		1–2	3–4	29–30	3

Standings are determined by: 1. number of wins; 2. number of matches; 3. in two-players-ties, head-to-head records; 4. in three-players-ties, percentage of sets won, or of games won; 5. steering-committee decision.

		Bryan Bryan	Dlouhý Paes	Kubot Marach	Mirnyi Ram	RR W–L	Set W–L	Game W–L	Standings
2	Bob Bryan Mike Bryan		6–3, 6–4	6–3, 6–4	4–6, 4–6	2–1	4–2	32–26	2
4	Lukáš Dlouhý Leander Paes	3–6, 4–6		4–6, 6–7(3–7)	6–7(1–7), 4–6	0–3	0–6	27–38	4
6	Łukasz Kubot Oliver Marach	3–6, 4–6	6–4, 7–6(7–3)		4–6, 6–4, [16–14]	2–1	4–3	31–32	3
7	Max Mirnyi Andy Ram	6–4, 6–4	7–6(7–1), 6–4	6–4, 4–6, [14–16]		2–1	5–2	35–29	1

Standings are determined by: 1. number of wins; 2. number of matches; 3. in two-players-ties, head-to-head records; 4. in three-players-ties, percentage of sets won, or of games won; 5. steering-committee decision.

• Draw