LeBron James has the most career games by an active player in the playoffs, with 282 games.

list of most playoff games by active nba players

NAME	GP	MPG	PPG	RPG	APG	SPG	BPG	TPG	FGM	FGA	FG%	3PM	3PA	3P%	FTM	FTA	FT%	MIN	PTS	REB	AST	STL	BLK	TOV	PF	+/-
LeBron James	282	41.3	28.5	9.0	7.2	1.7	1.0	3.6	10.2	20.6	49.5	1.6	4.9	33.1	6.5	8.7	74.1	11,654	8,023	2,549	2,023	471	270	1,015	644	+1322
Danny Green	169	25.3	7.9	3.2	1.2	1.0	0.7	0.8	2.8	7.0	40.4	1.9	4.8	38.8	0.4	0.6	74.5	4,271	1,338	541	200	176	125	143	347	+602
Al Horford	167	34.2	12.5	8.2	3.4	0.8	1.3	1.4	5.0	10.1	49.5	0.9	2.3	39.6	1.6	2.0	77.8	5,719	2,091	1,362	565	137	213	241	425	-100
Kevin Durant	166	40.5	29.4	7.8	4.2	1.0	1.2	3.3	9.9	20.8	47.6	2.2	6.1	35.5	7.4	8.5	86.9	6,725	4,878	1,301	696	170	198	540	419	+714
James Harden	160	35.9	22.7	5.5	6.3	1.7	0.5	3.5	6.8	16.1	42.4	2.5	7.4	33.8	6.6	7.6	86.9	5,750	3,637	883	1,013	267	85	555	483	+317
Klay Thompson	158	36.9	19.2	4.0	2.2	0.9	0.5	1.7	7.1	16.4	43.6	3.2	7.8	40.5	1.8	2.1	84.5	5,830	3,032	626	351	150	85	274	411	+615
Draymond Green	157	34.7	11.6	8.9	6.2	1.5	1.4	2.6	4.1	9.2	44.9	1.0	3.3	30.4	2.3	3.2	72.7	5,446	1,825	1,391	974	240	214	411	593	+993
Serge Ibaka	152	27.1	10.6	6.3	0.7	0.4	1.9	0.9	4.3	8.6	49.9	0.6	1.6	38.2	1.4	1.7	78.9	4,119	1,608	965	109	61	292	141	449	+263
Chris Paul	149	36.5	20.0	4.9	8.3	1.9	0.2	2.5	7.4	15.3	48.4	1.6	4.4	37.3	3.5	4.1	85.4	5,442	2,981	730	1,233	287	31	377	437	+130
Stephen Curry	147	37.4	27.0	5.3	6.2	1.5	0.3	3.3	9.0	19.9	45.3	4.2	10.6	39.7	4.7	5.3	88.9	5,492	3,966	786	912	223	44	489	375	+945
George Hill	144	30.2	11.1	3.0	2.6	0.9	0.2	1.3	3.7	8.2	45.2	1.2	3.3	37.2	2.4	3.0	80.2	4,344	1,592	425	369	123	33	184	319	+221
Kawhi Leonard	137	35.5	21.4	7.8	2.9	1.8	0.7	1.9	7.6	14.9	51.2	1.7	4.2	40.2	4.5	5.3	84.5	4,870	2,934	1,073	395	244	93	259	308	+661
Kyle Lowry	130	33.0	13.8	4.3	5.4	1.3	0.3	2.3	4.6	11.2	41.2	1.8	5.2	33.8	2.8	3.5	80.4	4,291	1,794	561	706	168	44	301	424	+171
Jimmy Butler	119	37.9	21.3	6.2	4.6	1.7	0.6	1.8	7.2	15.6	46.0	1.2	3.5	34.7	5.7	6.9	83.0	4,511	2,534	734	551	202	68	216	211	+25
Russell Westbrook	116	37.6	24.5	7.2	7.9	1.8	0.3	4.0	8.5	20.9	40.8	1.4	4.7	29.9	6.0	7.3	82.8	4,360	2,845	832	911	204	38	461	339	+111
Jae Crowder	111	29.2	10.4	5.3	1.9	0.9	0.5	0.9	3.5	8.8	39.3	1.9	5.5	33.6	1.6	2.1	76.8	3,240	1,149	587	208	102	52	96	302	-115
Marcus Smart	108	33.1	12.8	4.3	4.9	1.3	0.5	2.3	4.2	10.6	39.6	1.9	5.8	33.4	2.4	3.2	76.2	3,572	1,377	469	524	144	51	252	304	+46
Paul George	108	39.1	21.3	7.5	4.1	1.5	0.5	3.1	6.9	16.2	42.4	2.4	6.8	35.1	5.2	6.3	82.5	4,222	2,299	813	444	165	59	340	354	+201
Jaylen Brown	105	32.5	18.2	5.5	2.3	1.0	0.4	2.2	6.8	14.2	47.9	2.0	5.4	36.2	2.6	3.5	74.0	3,415	1,911	580	241	100	41	233	294	+117
Jeff Green	103	25.0	8.5	3.2	1.2	0.4	0.5	1.0	2.9	7.0	41.6	1.0	2.6	36.5	1.7	2.2	78.6	2,580	877	334	126	46	50	102	214	-166
P.J. Tucker	102	30.8	7.0	5.9	1.4	1.0	0.4	0.7	2.5	5.8	43.3	1.5	3.7	40.1	0.5	0.7	72.2	3,144	715	599	143	98	38	70	310	+296
Patty Mills	95	16.0	6.7	1.5	1.6	0.5	0.1	0.7	2.4	5.5	43.2	1.3	3.3	38.4	0.6	0.8	80.0	1,519	632	138	152	50	5	67	117	+152
Jayson Tatum	94	38.7	23.8	7.6	4.6	1.1	0.9	2.9	8.0	18.0	44.3	2.4	6.6	35.9	5.4	6.5	83.3	3,635	2,236	712	430	106	87	276	243	+265
Tristan Thompson	94	26.9	7.1	7.8	0.7	0.3	0.7	0.8	2.7	4.8	56.2	0.0	0.0	0.0	1.7	2.8	61.7	2,529	665	733	70	29	69	75	184	+122
Clint Capela	87	23.8	8.5	8.4	0.9	0.6	1.3	0.8	3.7	6.1	60.2	0.0	0.0	0.0	1.2	2.4	49.5	2,067	739	734	77	50	110	68	169	-98