Babe Ruth had his most RBIs in a month in August 1929, with 47 RBIs.

	NAME	RBI	MONTH	G	AB	R	H	2B	3B	HR	BB	HBP	SO	SB	PA	TB	XBH	SH	AVG	OBP	SLG	OPS
1	Babe Ruth B. Ruth	47	August 1929	31	118	31	41	7	2	15	12	0	16	0	133	97	24	3	.347	.408	.822	1.230
2	Babe Ruth B. Ruth	43	September 1927	27	103	29	39	3	1	17	19	0	15	3	126	95	21	4	.379	.475	.922	1.398
3	Babe Ruth B. Ruth	41	July 1931	31	120	32	44	6	0	10	23	0	11	1	143	80	16	0	.367	.469	.667	1.135
4	Babe Ruth B. Ruth	40	July 1924	37	131	43	59	9	3	14	31	0	16	2	164	116	26	2	.450	.556	.885	1.441
5	Babe Ruth B. Ruth	38	June 1931	27	103	30	41	5	0	9	25	1	7	1	129	73	14	0	.398	.519	.709	1.228
6	Babe Ruth B. Ruth	37	May 1928	29	99	32	41	5	4	15	28	1	20	0	129	99	24	1	.414	.547	1.000	1.547
7	Babe Ruth B. Ruth	37	June 1920	29	100	38	45	7	4	12	30	1	17	6	131	96	23	0	.450	.580	.960	1.540
8	Babe Ruth B. Ruth	35	June 1930	28	97	43	38	6	0	15	37	0	12	2	137	89	21	3	.392	.560	.918	1.477
9	Babe Ruth B. Ruth	35	July 1927	31	111	34	47	8	3	9	31	0	14	1	145	88	20	3	.423	.549	.793	1.342
10	Babe Ruth B. Ruth	34	July 1932	29	91	22	38	6	0	8	26	0	9	0	117	68	14	0	.418	.547	.747	1.294
11	Babe Ruth B. Ruth	34	May 1927	28	106	32	37	7	1	12	25	0	18	0	133	82	20	2	.349	.473	.774	1.247
12	Babe Ruth B. Ruth	34	August 1921	28	98	38	44	13	2	10	30	0	13	2	129	91	25	1	.449	.578	.929	1.507
13	Babe Ruth B. Ruth	33	May 1930	28	94	35	36	5	1	13	32	0	14	6	128	82	19	2	.383	.540	.872	1.412
14	Babe Ruth B. Ruth	33	May 1929	26	95	26	33	4	1	7	13	1	13	2	114	60	12	5	.347	.431	.632	1.063
15	Babe Ruth B. Ruth	33	July 1920	34	100	45	44	10	2	13	43	1	19	5	147	97	25	3	.440	.611	.970	1.581
16	Babe Ruth B. Ruth	32	June 1926	26	83	22	35	7	0	10	26	2	11	0	112	72	17	1	.422	.568	.867	1.435
17	Babe Ruth B. Ruth	31	June 1932	28	109	29	36	2	1	8	23	0	16	0	132	64	11	0	.330	.447	.587	1.034
18	Babe Ruth B. Ruth	31	August 1931	30	118	30	41	6	1	9	27	0	9	1	145	76	16	0	.347	.469	.644	1.113
19	Babe Ruth B. Ruth	31	July 1921	24	84	30	30	4	2	10	25	3	11	7	113	68	16	1	.357	.518	.810	1.327
20	Babe Ruth B. Ruth	30	July 1928	35	123	35	44	12	2	11	26	0	19	1	151	93	25	2	.358	.470	.756	1.226
21	Babe Ruth B. Ruth	30	May 1926	28	89	31	32	2	0	12	31	0	10	3	122	70	14	2	.360	.525	.787	1.312
22	Babe Ruth B. Ruth	30	August 1923	25	86	25	38	9	1	8	28	2	12	2	117	73	18	1	.442	.586	.849	1.435
23	Babe Ruth B. Ruth	29	September 1925	27	102	17	36	8	1	9	14	1	16	0	119	73	18	2	.353	.436	.716	1.152
24	Babe Ruth B. Ruth	29	August 1922	24	98	21	34	8	3	10	11	0	20	0	110	78	21	1	.347	.413	.796	1.209
25	Babe Ruth B. Ruth	29	May 1921	28	107	27	33	5	4	10	25	1	19	1	133	76	19	0	.308	.444	.710	1.154