Shaquille O'Neal has missed the most free throws in a playoff game, with 21 misses in Game 2 of the 2000 NBA Finals against the Pacers.

most missed free throws in a playoff game

Interpreted as:

most missed free throws by a player in a playoff game

NAME	FT MISS	DATE	TM		OPP	MIN	PTS	REB	AST	STL	BLK	TOV	FGM	FGA	FG%	3PM	3PA	3P%	FTM	FTA	FT%	PF	+/-
Shaquille O'Neal	21	6/9/2000	LAL	vs	IND	46	40	24	4	0	3	2	11	18	61.1	0	0		18	39	46.2	5	+14
DeAndre Jordan	20	5/10/2015	LAC	vs	HOU	30	26	17	2	2	1	0	6	7	85.7	0	0		14	34	41.2	3	+16
Wilt Chamberlain	17	4/12/1966	PHI	vs	BOS	48	46	34	1				19	34	55.9				8	25	32.0	5
Wilt Chamberlain	15	4/17/1968	PHI	@	BOS	48	20	27	8				6	21	28.6				8	23	34.8	1
Wilt Chamberlain	15	4/16/1967	PHI	vs	SFW	44	10	38	10				4	10	40.0				2	17	11.8	2
Shaquille O'Neal	14	5/25/2004	LAL	vs	MIN	44	22	17	4	0	4	1	7	10	70.0	0	0		8	22	36.4	3	+12
Ben Wallace	14	5/2/2003	DET	@	ORL	46	20	17	1	4	5	2	6	11	54.5	0	0		8	22	36.4	3	+15
Shaquille O'Neal	14	5/20/2000	LAL	vs	POR	47	41	11	7	0	5	0	14	25	56.0	0	0		13	27	48.1	2	+22
Giannis Antetokounmpo	13	4/26/2023	MIL	vs	MIA	42	38	20	3	0	0	7	14	27	51.9	0	2	0.0	10	23	43.5	4	-8
Dwight Howard	13	5/6/2015	HOU	vs	LAC	35	24	16	3	1	4	1	8	11	72.7	0	0		8	21	38.1	4	-1
Shaquille O'Neal	13	5/31/2004	LAL	vs	MIN	38	25	11	1	0	1	4	9	15	60.0	0	0		7	20	35.0	5	+10
Andre Drummond	12	4/20/2016	DET	@	CLE	36	20	7	0	1	1	3	8	13	61.5	0	0		4	16	25.0	2	-4
Shaquille O'Neal	12	6/6/2001	LAL	vs	PHI	52	44	20	5	1	0	4	17	28	60.7	0	0		10	22	45.5	3	-6
Shaquille O'Neal	12	5/22/2000	LAL	vs	POR	39	23	12	4	0	0	3	9	16	56.3	0	0		5	17	29.4	4	-21
Shaquille O'Neal	12	5/13/1996	ORL	@	ATL	37	19	8	4	1	1	1	7	17	41.2	0	0		5	17	29.4	3
Wilt Chamberlain	12	4/9/1972	LAL	vs	MIL	43	10	24	0				3	12	25.0				4	16	25.0	3
Wilt Chamberlain	12	4/4/1970	LAL	@	PHX	48	29	19	0				12	20	60.0				5	17	29.4	1
Bill Russell	12	4/28/1968	BOS	@	LAL	48	11	22	6				2	7	28.6				7	19	36.8	5
Wilt Chamberlain	12	3/30/1968	PHI	@	NYK	48	23	27	5				9	18	50.0				5	17	29.4	3
Wilt Chamberlain	12	3/24/1965	PHI	@	CIN	53	26	23	4				10	21	47.6				6	18	33.3	2
DeAndre Jordan	11	4/22/2015	LAC	vs	SAS	44	20	15	0	0	3	1	7	10	70.0	0	0		6	17	35.3	3	-10
Shaquille O'Neal	11	4/29/2008	PHX	@	SAS	29	13	9	1	0	3	2	2	8	25.0	0	0		9	20	45.0	5	-4
Shaquille O'Neal	11	5/23/1999	LAL	vs	SAS	45	36	14	0	1	1	1	12	23	52.2	0	0		12	23	52.2	5	-6
Chet Walker	11	4/5/1968	PHI	vs	BOS	34	31	7	3				11	18	61.1				9	20	45.0	4
Wilt Chamberlain	11	3/27/1968	PHI	vs	NYK	58	18	24	8				8	10	80.0				2	13	15.4	2