The Phoenix Suns have the most steals per game by a team in a season, with 12.9 per game in 1977-78.

what team averaged the most steals in an nba season

TEAM	SPG	SEASON	GP	MPG	PPG	RPG	APG	BPG	TPG	FGM	FGA	FG%	3PM	3PA	3P%	FTM	FTA	FT%	MIN	PTS	REB	AST	STL	BLK	TOV	PF
Phoenix Suns	12.9	1977-78	82	241.2	112.3	45.7	28.5	4.5	21.5	45.5	95.6	47.6				21.3	28.4	75.1	19,780	9,211	3,745	2,338	1,059	372	1,766	1,956
Seattle SuperSonics	12.8	1993-94	82	240.6	105.9	41.2	25.8	4.5	15.4	40.7	84.2	48.4	3.0	8.8	33.5	21.6	29.0	74.5	19,730	8,687	3,381	2,112	1,053	365	1,262	1,914
Boston Celtics	12.0	1997-98	82	240.6	95.9	39.5	22.1	4.5	16.2	36.7	84.6	43.4	5.1	15.2	33.2	17.4	24.0	72.6	19,730	7,864	3,240	1,816	987	366	1,330	2,203
Golden State Warriors	11.9	1974-75	82	241.2	108.5	52.1	25.3	4.5	20.9	45.3	97.3	46.5				17.9	23.4	76.8	19,780	8,898	4,270	2,076	972	365	1,716	2,109
San Antonio Spurs	11.7	1988-89	82	240.9	105.5	42.4	24.8	5.2	20.9	42.3	90.4	46.8	0.8	3.6	21.5	20.1	28.9	69.8	19,755	8,652	3,476	2,037	961	423	1,712	2,153
Denver Nuggets	11.6	1976-77	82	241.2	112.6	48.6	27.6	5.7	24.5	43.8	91.1	48.1				25.0	33.9	73.8	19,780	9,233	3,988	2,262	953	471	2,011	2,142
Seattle SuperSonics	11.5	1992-93	82	241.2	108.3	42.4	23.2	5.0	15.5	42.4	87.1	48.6	2.7	7.4	35.7	21.0	27.5	76.1	19,780	8,884	3,476	1,906	944	409	1,267	1,971
Seattle SuperSonics	11.4	1976-77	82	241.5	104.0	46.2	21.6	6.1	21.5	41.9	93.2	45.0				20.1	29.1	69.0	19,805	8,524	3,788	1,772	932	503	1,759	2,198
Washington Bullets	11.3	1974-75	82	241.5	104.7	47.5	24.5	5.0	19.4	43.4	93.9	46.2				18.0	23.9	75.2	19,805	8,585	3,897	2,005	929	409	1,594	1,961
Golden State Warriors	11.3	1975-76	82	241.8	109.8	52.0	24.9	5.1	19.7	45.0	97.3	46.2				19.8	26.3	75.1	19,830	9,002	4,261	2,041	928	416	1,613	2,022
Indiana Pacers	11.3	1976-77	82	240.9	106.8	48.7	24.5	5.6	19.6	43.0	95.6	44.9				20.9	28.0	74.6	19,755	8,758	3,993	2,009	924	458	1,609	2,030
New Jersey Nets	11.2	1981-82	82	241.2	106.7	42.9	25.6	5.9	20.1	42.7	88.1	48.4	0.4	1.8	20.5	20.9	28.7	72.8	19,780	8,746	3,514	2,096	918	481	1,650	2,295
Seattle SuperSonics	11.2	1994-95	82	241.8	110.4	41.5	25.8	4.8	15.8	40.4	82.2	49.1	6.0	15.9	37.6	23.7	31.3	75.8	19,830	9,055	3,405	2,115	917	392	1,295	2,067
Atlanta Hawks	11.2	1977-78	82	241.8	103.7	42.9	23.2	5.0	19.4	40.7	88.5	46.0				22.4	28.2	79.3	19,830	8,506	3,519	1,901	916	408	1,592	2,470
Atlanta Hawks	11.2	1993-94	82	240.9	101.4	44.8	25.1	5.5	15.3	39.6	85.8	46.1	3.3	10.1	32.3	19.0	25.2	75.2	19,755	8,318	3,673	2,056	915	449	1,252	1,625
Phoenix Suns	11.2	1978-79	82	241.2	115.4	42.2	30.5	4.1	21.5	46.9	91.7	51.2				21.5	28.0	76.8	19,780	9,459	3,462	2,500	915	337	1,760	1,944
New Jersey Nets	11.1	1982-83	82	240.3	105.8	45.0	26.1	7.2	22.8	42.8	87.1	49.2	0.4	1.8	20.1	19.8	28.1	70.5	19,705	8,672	3,693	2,143	911	592	1,873	2,166
Phoenix Suns	11.1	1979-80	82	240.9	111.1	43.0	27.8	4.2	19.9	43.5	88.2	49.3	0.8	3.4	24.3	23.2	30.1	77.3	19,755	9,114	3,529	2,283	908	344	1,629	1,853
Seattle SuperSonics	11.0	1996-97	82	241.2	100.9	40.0	23.5	4.7	15.0	36.5	78.2	46.7	6.8	19.3	35.3	21.0	28.0	75.2	19,780	8,274	3,281	1,931	904	388	1,231	1,803
Golden State Warriors	11.0	1976-77	82	241.2	110.9	48.0	25.9	5.3	19.8	45.4	95.5	47.5				20.1	26.5	75.9	19,780	9,097	3,939	2,120	904	432	1,624	2,058
New York Knicks	11.0	1988-89	82	241.5	116.7	43.7	25.4	5.4	19.2	45.1	92.8	48.6	4.7	14.0	33.7	21.7	28.9	75.2	19,805	9,567	3,587	2,083	900	446	1,572	2,053
Indiana Pacers	11.0	1979-80	82	242.1	111.2	45.4	26.2	6.5	18.5	44.4	93.8	47.3	1.1	3.8	28.0	21.4	28.5	75.1	19,855	9,119	3,724	2,148	900	530	1,517	1,973
Milwaukee Bucks	10.9	1990-91	82	242.1	106.4	39.5	25.3	4.0	16.1	40.7	84.7	48.0	3.1	9.2	34.1	21.9	27.3	80.1	19,855	8,727	3,241	2,075	894	330	1,321	2,033
Denver Nuggets	10.9	1984-85	82	241.8	120.0	44.3	27.6	5.2	16.9	47.3	97.3	48.6	0.9	2.9	31.1	24.6	31.3	78.5	19,830	9,841	3,634	2,266	894	424	1,382	2,152
Philadelphia 76ers	10.8	1998-99	50	243.0	89.7	43.1	18.7	5.4	16.4	33.1	77.7	42.6	2.0	7.4	26.4	21.5	29.7	72.2	12,150	4,483	2,157	934	542	271	822	1,152