The Ottawa Senators had their best record in a season in 2005-06 and in 2002-03, with a record of 52-21-9.

what was the best record in a season for the senators

TEAM	REC	SEASON	GP	PTS	W	L	T	OTL	PTS%	G	GA	PP%	PK%	S/GP	SA/GP
Ottawa Senators	52-21-9	2005-06	82	113	52	21		9	.689	312	205	20.8	84.7	34.28	28.59
Ottawa Senators	52-21-8-1	2002-03	82	113	52	21	8	1	.689	263	182	21.2	84.9	29.78	24.79
Ottawa Senators	48-21-9-4	2000-01	82	109	48	21	9	4	.665	274	205	18.6	86.4	30.20	27.26
Ottawa Senators	48-25-9	2006-07	82	105	48	25		9	.640	286	216	17.9	84.5	32.33	30.23
Ottawa Senators	44-23-15	1998-99	82	103	44	23	15		.628	239	179	14.9	86.1	30.52	25.22
Ottawa Senators	43-23-10-6	2003-04	82	102	43	23	10	6	.622	262	189	21.6	83.6	29.52	24.88
Ottawa Senators	43-26-13	2014-15	82	99	43	26		13	.604	232	208	16.8	82.9	30.96	32.13
Ottawa Senators	44-28-10	2016-17	82	98	44	28		10	.598	206	210	17.0	79.7	30.04	30.09
Ottawa Senators	25-17-6	2012-13	48	56	25	17		6	.583	112	100	15.9	88.0	33.15	31.29
Ottawa Senators	41-28-11-2	1999-00	82	95	41	28	11	2	.579	244	210	16.8	87.5	31.51	25.17
Ottawa Senators	44-32-6	2009-10	82	94	44	32		6	.573	220	233	16.9	84.3	29.71	28.54
Ottawa Senators	43-31-8	2007-08	82	94	43	31		8	.573	258	242	18.3	81.1	30.13	29.95
Ottawa Senators	39-27-9-7	2001-02	82	94	39	27	9	7	.573	243	208	16.6	84.4	30.11	25.93
Ottawa Senators	41-31-10	2011-12	82	92	41	31		10	.561	243	236	18.1	81.6	31.39	32.04
Ottawa Senators	37-31-14	2013-14	82	88	37	31		14	.537	229	258	18.5	80.9	32.83	34.74
Ottawa Senators	39-35-8	2022-23	82	86	39	35		8	.524	259	270	23.5	80.1	33.49	31.37
Ottawa Senators	38-35-9	2015-16	82	85	38	35		9	.518	230	241	15.8	75.8	28.35	32.78
Ottawa Senators	36-35-11	2008-09	82	83	36	35		11	.506	213	231	19.5	81.5	29.33	28.50
Ottawa Senators	34-33-15	1997-98	82	83	34	33	15		.506	193	200	12.8	84.5	29.28	24.87
Ottawa Senators	37-41-4	2023-24	82	78	37	41		4	.476	250	281	18.0	75.1	31.73	29.66
Ottawa Senators	31-36-15	1996-97	82	77	31	36	15		.470	226	234	16.7	81.9	29.23	25.82
Ottawa Senators	23-28-5	2020-21	56	51	23	28		5	.455	155	189	15.5	78.9	29.70	32.13
Ottawa Senators	32-40-10	2010-11	82	74	32	40		10	.451	190	245	17.5	83.7	29.04	31.21
Ottawa Senators	33-42-7	2021-22	82	73	33	42		7	.445	224	264	19.3	80.3	30.04	33.41
Ottawa Senators	25-34-12	2019-20	71	62	25	34		12	.437	190	238	14.2	76.1	30.62	33.58