John Stockton had the most games with 15+ assists, with 293 games.

most 15 assist games in nba history by a player

Interpreted as:

most 15 or more assist regular-season games in NBA history by a player

NAME	GP	AST	MPG	PPG	RPG	APG	SPG	BPG	TPG	FGM	FGA	FG%	3PM	3PA	3P%	FTM	FTA	FT%	MIN	PTS	REB	STL	BLK	TOV	PF	+/-
John Stockton	293	4,982	38.0	15.9	3.1	17.0	2.8	0.2	3.2	5.7	10.8	52.8	0.7	1.7	40.1	3.8	4.5	82.5	11,131	4,646	912	821	70	948	836	+281
Magic Johnson	180	3,061	38.6	19.6	7.3	17.0				6.7	12.9	52.0	0.5	1.4	32.4	5.7	6.6	86.1	6,942	3,525	1,321				361
Steve Nash	110	1,817	36.5	15.5	4.1	16.5	0.8	0.1	3.5	5.5	11.4	48.0	1.4	3.5	40.5	3.1	3.4	91.4	4,015	1,700	454	86	10	387	165	+1029
Chris Paul	107	1,737	37.2	18.7	5.1	16.2	2.4	0.2	2.5	6.9	14.2	48.6	1.1	3.3	32.1	3.8	4.4	86.5	3,976	1,999	545	261	17	263	247	+1415
Isiah Thomas	98	1,641	39.0	20.1	4.1	16.7	2.2		3.6	7.8	16.5	47.1	0.3	1.2	24.6	4.2	5.3	79.1	3,821	1,971	399	211		354	313
Jason Kidd	87	1,407	40.9	13.3	7.6	16.2	2.5	0.3	3.5	4.5	11.9	37.5	1.3	4.0	33.5	3.0	3.8	77.9	3,562	1,153	658	217	25	306	177	+551
Kevin Johnson	87	1,434	40.3	20.4	4.3	16.5	1.9	0.3	3.6	7.1	14.0	50.6	0.2	0.7	26.3	6.1	7.3	83.9	3,508	1,778	372	168	26	316	196	+51
Rajon Rondo	82	1,364	37.8	11.2	6.4	16.6	2.3	0.1	3.6	4.7	10.9	43.6	0.4	1.4	25.9	1.4	2.4	60.3	3,097	922	526	186	12	297	182	+533
Mark Jackson	71	1,155	38.8	12.5	5.2	16.3	1.7	0.1	3.2	4.9	10.2	47.9	0.7	2.0	35.3	2.1	2.6	79.5	2,754	890	371	122	9	229	171	+243
Russell Westbrook	68	1,129	36.5	21.6	10.9	16.6	1.8	0.4	4.5	7.8	17.8	43.9	1.4	4.3	32.3	4.6	6.2	73.5	2,479	1,469	743	121	29	308	182	+621
Muggsy Bogues	48	785	38.0	10.5	4.2	16.4	2.0	0.1	1.9	4.4	9.1	48.4	0.1	0.3	25.0	1.6	2.2	74.3	1,824	506	200	96	3	92	96	+12
Deron Williams	45	738	38.8	16.9	3.4	16.4	1.5	0.3	3.1	6.2	14.0	44.0	1.2	3.9	30.5	3.4	4.2	80.0	1,747	761	155	67	15	141	111	+505
Tim Hardaway	40	661	42.0	22.2	4.4	16.5	2.0	0.1	3.5	8.6	18.2	47.1	1.8	4.9	37.4	3.2	4.2	75.7	1,678	887	174	79	4	140	106	+41
James Harden	38	606	38.3	27.2	8.3	15.9	1.8	0.4	4.7	8.1	17.1	47.5	3.4	8.5	39.5	7.6	8.7	87.5	1,455	1,034	317	67	14	180	92	+422
Rod Strickland	35	576	40.1	17.5	5.2	16.5	2.1	0.2	3.3	6.4	14.3	44.7	0.2	0.8	29.6	4.5	6.2	72.4	1,402	611	181	75	6	117	73	+169
Terry Porter	33	523	39.2	17.2	5.3	15.8	2.5	0.2	3.2	6.4	12.4	51.5	1.0	2.5	41.5	3.5	4.2	82.0	1,292	568	174	81	7	107	64	+12
John Wall	31	504	38.4	17.0	3.7	16.3	2.0	0.6	4.0	6.5	17.0	38.5	0.8	3.0	27.7	3.1	4.0	77.4	1,190	528	114	62	18	125	54	+302
Andre Miller	29	476	39.8	15.9	5.3	16.4	2.2	0.3	3.0	5.9	12.7	46.6	0.2	1.0	20.0	3.8	4.8	79.9	1,153	461	154	63	10	86	70	+163
Brevin Knight	28	453	37.3	11.6	3.6	16.2	3.0	0.3	2.8	3.7	9.7	37.9	0.0	0.3	11.1	4.3	5.2	82.1	1,045	326	102	85	7	78	87	+96
Trae Young	27	430	38.2	26.3	4.0	15.9	1.1	0.3	4.7	8.1	18.6	43.7	2.6	7.9	32.9	7.4	8.5	87.3	1,031	710	107	30	7	128	48	+88
Sleepy Floyd	26	418	39.3	16.8	3.7	16.1	1.7	0.4	3.1	5.9	12.2	48.4	0.5	1.6	33.3	4.4	5.4	82.1	1,023	437	96	45	10	80	70
Luka Doncic	24	388	38.9	30.4	10.9	16.2	1.6	0.5	4.2	9.9	22.2	44.7	3.0	9.1	33.3	7.5	9.7	78.0	933	730	262	39	11	101	57	+192
LeBron James	24	381	40.2	25.9	9.0	15.9	1.6	1.0	3.7	9.5	18.3	51.7	1.8	5.2	34.4	5.2	7.1	72.5	965	621	216	38	23	88	49	+149
Nick Van Exel	24	389	41.2	15.4	3.8	16.2	1.4	0.2	3.3	5.8	14.7	39.4	1.6	5.7	28.5	2.2	2.7	80.0	989	369	92	34	4	79	32	+101
Doc Rivers	24	390	34.6	11.5	4.3	16.3	3.4	0.4	2.9	3.5	8.5	41.9	0.3	0.7	43.8	4.1	5.3	77.2	830	275	103	81	10	70	75