The Cleveland Cavaliers had their best record in a season in 2008-09, with a record of 66-16.

what was the best record in a season for the cavaliers

TEAM	REC	SEASON	GP	W%	MPG	PPG	RPG	APG	SPG	BPG	TPG	FGM	FGA	FG%	3PM	3PA	3P%	FTM	FTA	FT%	MIN	PTS	REB	AST	STL	BLK	TOV	PF
Cleveland Cavaliers	66-16	2008-09	82	.805	241.2	100.3	42.2	20.3	7.2	5.3	12.7	36.9	78.7	46.8	8.0	20.4	39.3	18.6	24.5	75.7	19,780	8,223	3,460	1,663	593	435	1,045	1,663
Cleveland Cavaliers	61-21	2009-10	82	.744	241.2	102.1	42.5	22.4	6.9	5.2	13.9	37.8	77.9	48.5	7.3	19.3	38.1	19.1	26.6	72.0	19,780	8,373	3,483	1,835	564	425	1,137	1,591
Cleveland Cavaliers	57-25	2015-16	82	.695	242.1	104.3	44.5	22.7	6.7	3.9	13.6	38.7	84.0	46.0	10.7	29.6	36.2	16.3	21.7	74.8	19,855	8,555	3,650	1,861	551	317	1,114	1,666
Cleveland Cavaliers	57-25	1991-92	82	.695	241.5	108.9	42.6	27.6	7.5	7.6	13.1	41.8	85.7	48.8	3.1	8.6	35.7	22.2	27.5	80.5	19,805	8,926	3,491	2,260	616	621	1,073	1,556
Cleveland Cavaliers	57-25	1988-89	82	.695	240.9	108.8	42.8	27.6	9.6	7.1	16.1	42.3	84.2	50.2	2.1	5.8	35.9	22.2	29.7	74.7	19,755	8,923	3,508	2,260	791	586	1,323	1,592
Cleveland Cavaliers	54-28	1992-93	82	.659	241.8	107.7	41.8	28.6	7.5	6.5	13.7	41.8	84.0	49.7	3.5	9.0	38.1	20.7	25.8	80.2	19,830	8,832	3,425	2,349	615	536	1,120	1,580
Cleveland Cavaliers	53-29	2014-15	82	.646	241.2	103.1	43.0	22.1	7.4	4.1	14.3	37.7	82.2	45.8	10.1	27.5	36.7	17.7	23.6	75.1	19,780	8,457	3,523	1,814	603	340	1,171	1,510
Cleveland Cavaliers	51-31	2022-23	82	.622	242.4	112.3	41.1	24.9	7.1	4.7	13.3	41.6	85.2	48.8	11.6	31.6	36.7	17.5	22.5	78.0	19,880	9,205	3,369	2,045	586	384	1,094	1,560
Cleveland Cavaliers	51-31	2016-17	82	.622	242.4	110.3	43.7	22.7	6.6	4.0	13.7	39.9	84.9	47.0	13.0	33.9	38.4	17.5	23.3	74.8	19,880	9,048	3,587	1,858	539	327	1,121	1,486
Cleveland Cavaliers	50-32	2017-18	82	.610	240.6	110.9	42.1	23.4	7.1	3.8	13.7	40.4	84.8	47.6	12.0	32.1	37.2	18.1	23.3	77.9	19,730	9,091	3,455	1,916	582	312	1,126	1,524
Cleveland Cavaliers	50-32	2006-07	82	.610	242.4	96.8	43.5	20.8	7.6	4.3	14.4	36.3	81.2	44.7	6.0	17.1	35.2	18.1	26.0	69.6	19,880	7,934	3,568	1,708	625	353	1,177	1,781
Cleveland Cavaliers	50-32	2005-06	82	.610	241.8	97.6	42.3	19.0	6.9	4.8	13.9	35.5	78.2	45.4	6.1	17.9	33.9	20.6	28.3	72.9	19,830	8,002	3,470	1,560	567	392	1,137	1,733
Cleveland Cavaliers	49-33	1975-76	82	.598	241.5	101.7	46.1	22.5	7.8	4.8	16.2	42.6	94.0	45.4				16.4	22.3	73.7	19,805	8,340	3,780	1,844	638	397	1,330	1,871
Cleveland Cavaliers	48-34	2023-24	82	.585	241.5	112.6	43.3	28.0	7.4	4.6	13.6	41.8	87.2	47.9	13.5	36.8	36.7	15.6	20.4	76.5	19,805	9,236	3,549	2,299	605	380	1,112	1,436
Cleveland Cavaliers	47-35	1997-98	82	.573	241.8	92.5	40.1	23.1	9.9	5.1	17.3	34.4	75.7	45.4	3.6	9.8	37.2	20.2	26.7	75.6	19,830	7,585	3,286	1,894	814	419	1,421	1,939
Cleveland Cavaliers	47-35	1995-96	82	.573	241.8	91.1	35.6	22.2	8.2	4.1	13.1	33.7	73.1	46.0	7.3	19.3	37.7	16.5	21.6	76.3	19,830	7,473	2,922	1,818	674	340	1,073	1,685
Cleveland Cavaliers	47-35	1993-94	82	.573	242.1	101.2	42.0	25.0	8.6	5.2	13.9	38.2	82.1	46.5	3.6	9.9	36.2	21.2	27.5	77.0	19,855	8,296	3,443	2,049	705	426	1,136	1,701
Cleveland Cavaliers	45-37	2007-08	82	.549	242.1	96.4	44.6	20.0	7.1	5.2	14.0	35.8	81.7	43.9	6.7	18.8	35.8	18.0	25.1	71.7	19,855	7,903	3,655	1,640	579	427	1,145	1,712
Cleveland Cavaliers	44-38	2021-22	82	.537	240.6	107.8	44.2	25.2	7.1	4.2	14.4	39.7	84.6	46.9	11.6	32.8	35.5	16.8	22.1	76.0	19,730	8,839	3,623	2,064	580	343	1,181	1,433
Cleveland Cavaliers	43-39	1994-95	82	.524	243.0	90.5	40.0	20.4	7.7	4.3	14.3	33.6	76.3	44.1	4.9	12.6	38.5	18.4	24.2	76.0	19,930	7,417	3,282	1,672	630	349	1,176	1,694
Cleveland Cavaliers	43-39	1977-78	82	.524	242.4	104.4	47.1	21.2	8.4	5.5	16.9	42.6	94.0	45.4				19.1	25.8	74.1	19,880	8,561	3,863	1,740	692	455	1,382	1,832
Cleveland Cavaliers	43-39	1976-77	82	.524	241.2	102.1	47.3	22.5	7.1	5.8	16.5	42.1	93.8	44.9				17.9	24.3	73.7	19,780	8,370	3,875	1,845	579	472	1,356	1,951
Cleveland Cavaliers	42-40	2004-05	82	.512	242.1	96.5	42.3	22.6	8.0	5.6	13.9	36.5	81.5	44.7	3.7	11.0	33.2	19.9	26.5	75.2	19,855	7,914	3,469	1,851	654	461	1,141	1,850
Cleveland Cavaliers	42-40	1996-97	82	.512	242.1	87.5	37.4	20.9	8.0	3.8	14.5	33.0	72.8	45.3	5.9	15.7	37.6	15.6	21.6	72.3	19,855	7,173	3,068	1,714	655	315	1,188	1,882
Cleveland Cavaliers	42-40	1989-90	82	.512	242.4	102.6	42.8	25.7	7.9	6.2	15.2	39.2	85.1	46.1	4.2	10.4	40.7	20.0	26.8	74.4	19,880	8,411	3,508	2,106	645	512	1,243	1,666