The Cincinnati Reds launched their most homers in a game against the Phillies on September 4, 1999, with 9 home runs.

Interpreted as:

most home runs in a regular-season game by reds

	TEAM	HR	DATE	TM		OPP	RESULT	AB	R	H	2B	3B	RBI	BB	HBP	SO	SB	CS	PA	TB	XBH	SH	SF	IBB	GIDP	AVG	OBP	SLG	OPS
1	Reds	9	9/4/1999	CIN	@	PHI	W 22-3	47	22	19	3	0	22	8	1	8	0	0	56	49	12	0	0	0	0	.404	.500	1.043	1.543
2	Redlegs	8	8/18/1956	CIN	vs	MIL	W 13-4	37	13	14	1	0	13	3	0	3	0	0	42	39	9	1	1	0	0	.378	.415	1.054	1.469
3	Reds	7	8/13/2011	CIN	vs	SDP	W 13-1	36	13	13	1	0	13	2	0	7	0	0	38	35	8	0	0	0	1	.361	.395	.972	1.367
4	Reds	7	7/4/2010	CIN	@	CHC	W 14-3	43	14	16	1	1	14	3	0	5	0	0	46	40	9	0	0	0	0	.372	.413	.930	1.343
5	Reds	7	9/19/2008	CIN	vs	MIL	W 11-2	40	11	15	0	0	11	1	0	5	1	0	41	36	7	0	0	0	0	.375	.390	.900	1.290
6	Reds	7	7/10/2008	CIN	@	CHC	W 12-7	44	12	18	1	0	12	3	0	6	1	0	48	40	8	0	1	0	0	.409	.438	.909	1.347
7	Reds	7	5/7/2008	CIN	vs	CHC	W 9-0	38	9	15	0	0	9	4	0	6	1	0	43	36	7	1	0	0	0	.395	.452	.947	1.400
8	Reds	7	9/15/1987	CIN	@	ATL	W 21-6	47	21	19	3	1	21	3	0	9	0	0	51	45	11	1	0	1	0	.404	.440	.957	1.397
9	Reds	7	4/21/1970	CIN	@	ATL	W 13-8	44	13	17	2	0	13	2	0	7	1	0	46	40	9	0	0	0	1	.386	.413	.909	1.322
10	Redlegs	7	6/1/1957	CIN	vs	CHC	W 22-2	45	22	22	5	0	22	8	1	6	0	1	56	48	12	1	1	2	0	.489	.564	1.067	1.630
11	Reds	6	7/13/2024	CIN	vs	MIA	W 10-6	34	10	10	0	0	9	0	1	13	0	0	35	28	6	0	0	0	0	.294	.314	.824	1.138
12	Reds	6	9/29/2023	CIN	@	STL	W 19-2	45	19	17	3	2	17	2	1	7	1	0	48	42	11	0	0	0	0	.378	.417	.933	1.350
13	Reds	6	4/22/2021	CIN	vs	ARI	L 11-14	44	11	13	1	0	11	4	0	13	0	0	48	32	7	0	0	0	0	.295	.354	.727	1.081
14	Reds	6	8/10/2019	CIN	vs	CHC	W 10-1	40	10	18	5	0	10	3	1	6	0	1	45	41	11	1	0	0	0	.450	.500	1.025	1.525
15	Reds	6	4/5/2013	CIN	vs	WSH	W 15-0	42	15	19	3	0	15	1	1	10	1	0	45	40	9	0	1	0	1	.452	.467	.952	1.419
16	Reds	6	5/29/2010	CIN	vs	HOU	W 12-2	39	12	18	2	1	12	2	0	3	1	0	41	40	9	0	0	0	3	.462	.488	1.026	1.513
17	Reds	6	4/11/2006	CIN	@	CHC	W 9-2	36	9	10	0	0	9	4	0	7	0	1	40	28	6	0	0	0	0	.278	.350	.778	1.128
18	Reds	6	8/21/2005	CIN	vs	ARI	W 13-6	39	13	17	2	0	13	3	0	6	0	0	42	37	8	0	0	0	1	.436	.476	.949	1.425
19	Reds	6	6/8/2005	CIN	vs	TBD	W 11-9	38	11	14	0	0	11	3	0	6	0	0	41	32	6	0	0	0	1	.368	.415	.842	1.257
20	Reds	6	4/20/2003	CIN	@	MON	W 7-5	37	7	11	0	0	7	1	1	10	0	0	40	29	6	1	0	0	0	.297	.333	.784	1.117
21	Reds	6	8/2/2001	CIN	@	LAD	W 7-4	36	7	9	0	0	7	2	0	6	0	1	38	27	6	0	0	0	0	.250	.289	.750	1.039
22	Reds	6	9/22/2000	CIN	vs	HOU	W 12-5	36	12	14	3	0	12	5	0	8	1	0	42	35	9	0	1	0	1	.389	.452	.972	1.425
23	Reds	6	9/7/1999	CIN	@	CHC	W 10-3	42	10	16	3	0	10	5	0	8	3	1	47	37	9	0	0	0	0	.381	.447	.881	1.328
24	Reds	6	5/19/1999	CIN	@	COL	W 24-12	53	24	28	9	0	23	9	0	8	1	1	64	55	15	1	1	1	1	.528	.587	1.038	1.625
25	Reds	6	4/29/1978	CIN	@	NYM	W 14-7	45	14	20	3	0	14	6	0	13	3	0	52	41	9	1	0	3	0	.444	.510	.911	1.421