Ryan Howard and Kendrys Morales were tied for the most RBIs in August 2009, with 33 RBIs.

	NAME	RBI	MONTH	G	AB	R	H	2B	3B	HR	BB	HBP	SO	SB	CS	PA	TB	XBH	SH	SF	IBB	GIDP	AVG	OBP	SLG	OPS
1	Ryan Howard R. Howard	33	August 2009	27	107	18	32	6	1	11	10	0	32	1	0	118	73	18	0	1	0	0	.299	.356	.682	1.038
2	Kendrys Morales K. Morales	33	August 2009	28	109	22	42	8	0	10	5	0	19	0	1	115	80	18	0	1	0	4	.385	.409	.734	1.143
3	Carlos Pena C. Pena	29	August 2009	26	89	18	22	3	0	12	16	1	24	0	2	107	61	15	0	1	2	3	.247	.364	.685	1.050
4	Prince Fielder P. Fielder	28	August 2009	27	107	14	29	2	0	11	14	1	20	1	1	123	64	13	0	1	3	2	.271	.358	.598	.956
5	Matt Kemp M. Kemp	27	August 2009	28	112	22	35	9	0	9	6	0	34	6	3	120	71	18	0	2	0	2	.313	.342	.634	.976
6	Mark Teixeira M. Teixeira	26	August 2009	28	109	17	32	7	0	6	17	1	19	1	0	128	57	13	0	1	1	2	.294	.391	.523	.914
7	Hideki Matsui H. Matsui	25	August 2009	24	89	16	25	3	0	8	6	1	11	0	1	96	52	11	0	0	1	2	.281	.333	.584	.918
8	Ryan Braun R. Braun	25	August 2009	27	117	19	35	6	0	7	7	2	16	3	1	127	62	13	0	1	0	3	.299	.346	.530	.876
9	Miguel Cabrera M. Cabrera	25	August 2009	28	108	19	37	8	0	7	8	3	27	2	0	119	66	15	0	0	1	1	.343	.403	.611	1.014
10	Matt Holliday M. Holliday	24	August 2009	26	99	19	30	5	2	7	9	1	15	1	2	112	60	14	0	3	1	1	.303	.357	.606	.963
11	Joe Mauer J. Mauer	23	August 2009	28	115	21	45	6	0	8	12	0	9	3	0	127	75	14	0	0	4	3	.391	.449	.652	1.101
12	Troy Tulowitzki T. Tulowitzki	23	August 2009	27	107	21	37	7	3	5	10	0	25	2	3	118	65	15	0	1	0	3	.346	.398	.607	1.006
13	Ryan Zimmerman R. Zimmerman	23	August 2009	28	100	23	35	7	2	7	17	1	17	2	0	120	67	16	0	2	1	2	.350	.442	.670	1.112
14	Elijah Dukes E. Dukes	22	August 2009	25	88	7	23	5	1	2	9	2	13	0	2	102	36	8	0	3	1	3	.261	.333	.409	.742
15	Mark Ellis M. Ellis	22	August 2009	29	100	12	34	8	0	2	8	0	14	2	0	112	48	10	2	2	1	1	.340	.382	.480	.862
16	Carlos Lee C. Lee	22	August 2009	28	110	14	34	9	0	5	6	1	12	1	0	119	58	14	0	2	1	5	.309	.345	.527	.872
17	Derrek Lee D. Lee	22	August 2009	28	107	14	34	11	1	6	15	1	26	0	0	123	65	18	0	0	1	5	.318	.407	.607	1.014
18	Jose Lopez J. Lopez	22	August 2009	29	120	14	31	10	0	6	5	2	14	1	0	128	59	16	0	1	1	3	.258	.297	.492	.789
19	Russell Branyan R. Branyan	21	August 2009	26	102	11	21	3	0	7	10	3	41	0	0	116	45	10	0	1	0	2	.206	.293	.441	.734
20	Andre Ethier A. Ethier	21	August 2009	29	114	18	38	11	2	6	11	4	22	2	0	129	71	19	0	0	2	2	.333	.411	.623	1.034
21	Mark Reynolds M. Reynolds	21	August 2009	25	94	18	26	3	0	11	12	2	37	4	0	108	62	14	0	0	1	2	.277	.370	.660	1.030
22	Brian McCann B. McCann	20	August 2009	24	92	11	21	3	0	5	6	1	18	0	0	100	39	8	0	1	0	5	.228	.280	.424	.704
23	Billy Butler B. Butler	20	August 2009	29	117	15	36	10	0	4	8	0	17	0	0	127	58	14	0	2	0	5	.308	.346	.496	.842
24	Kevin Kouzmanoff K. Kouzmanoff	20	August 2009	29	103	7	30	9	0	2	12	3	15	0	0	119	45	11	0	1	2	6	.291	.378	.437	.815
25	Michael Young M. Young	20	August 2009	29	121	17	39	4	1	6	8	1	20	1	1	132	63	11	0	2	2	2	.322	.364	.521	.884