Magic Johnson has the most assists in an NBA Finals game, with 21 assists against the Celtics on June 3, 1984.

what are the most assists by a player in a finals game

NAME	AST	DATE	SEASON	SERIES	TM		OPP	MIN	PTS	REB	STL	BLK	TOV	FGM	FGA	FG%	3PM	3PA	3P%	FTM	FTA	FT%	PF	+/-
Magic Johnson	21	6/3/1984	1983-84	NBA Finals	LAL	vs	BOS	39	14	11	1	1	2	4	6	66.7	0	0		6	10	60.0	3
Magic Johnson	20	6/12/1991	1990-91	NBA Finals	LAL	vs	CHI	48	16	11	1	0	6	4	12	33.3	2	6	33.3	6	6	100.0	0
Magic Johnson	20	6/4/1987	1986-87	NBA Finals	LAL	vs	BOS	31	22	5	3	0	2	10	17	58.8	0	0		2	2	100.0	2
Magic Johnson	19	6/19/1988	1987-88	NBA Finals	LAL	vs	DET	45	22	4	2	0	2	5	12	41.7	0	1	0.0	12	13	92.3	2
Magic Johnson	19	6/14/1987	1986-87	NBA Finals	LAL	vs	BOS	42	16	8	3	1	3	7	21	33.3	0	1	0.0	2	2	100.0	2
Walt Frazier	19	5/8/1970	1969-70	NBA Finals	NYK	vs	LAL	44	36	7				12	17	70.6				12	12	100.0	3
Bob Cousy	19	4/7/1959	1958-59	NBA Finals	BOS	@	MIN	48	23	3				6	18	33.3				11	15	73.3	2
Bob Cousy	19	4/9/1957	1956-57	NBA Finals	BOS	vs	STL	45	21	8				8	21	38.1				5	8	62.5	3
Jerry West	18	5/1/1970	1969-70	NBA Finals	LAL	vs	NYK	52	37	5				13	26	50.0				11	12	91.7	4
Magic Johnson	17	6/16/1988	1987-88	NBA Finals	LAL	@	DET	45	15	6	2	1	4	4	15	26.7	0	0		7	11	63.6	3
Robert Reid	17	6/5/1986	1985-86	NBA Finals	HOU	vs	BOS	41	13	6	1	0	0	6	15	40.0	0	1	0.0	1	1	100.0	4
Dennis Johnson	17	6/7/1985	1984-85	NBA Finals	BOS	@	LAL	48	22	3	1	0	6	10	21	47.6	0	3	0.0	2	2	100.0	3
Magic Johnson	17	6/7/1985	1984-85	NBA Finals	LAL	vs	BOS	42	26	6	2	0	2	11	20	55.0	0	0		4	4	100.0	1
Magic Johnson	17	6/6/1984	1983-84	NBA Finals	LAL	vs	BOS	49	20	11	2	0	7	8	12	66.7	0	0		4	7	57.1	5
Rajon Rondo	16	6/8/2008	2007-08	NBA Finals	BOS	vs	LAL	42	4	6	2	1	2	1	4	25.0	0	0		2	6	33.3	3	-5
Magic Johnson	16	6/2/1985	1984-85	NBA Finals	LAL	vs	BOS	39	17	9	2	0	1	6	13	46.2	1	2	50.0	4	4	100.0	2
Magic Johnson	15	6/12/1984	1983-84	NBA Finals	LAL	@	BOS	43	16	5	4	2	7	5	14	35.7	0	0		6	7	85.7	5
Bob Cousy	15	4/5/1959	1958-59	NBA Finals	BOS	vs	MIN	47	21	11				9	22	40.9				3	6	50.0	2
Nikola Jokic	14	6/1/2023	2022-23	NBA Finals	DEN	vs	MIA	40	27	10	1	1	2	8	12	66.7	1	2	50.0	10	12	83.3	1	+14
LeBron James	14	6/4/2017	2016-17	NBA Finals	CLE	@	GSW	39	29	11	3	1	4	12	18	66.7	1	3	33.3	4	5	80.0	2	-11
Anfernee Hardaway	14	6/11/1995	1994-95	NBA Finals	ORL	@	HOU	41	19	4	1	2	3	4	10	40.0	1	4	25.0	10	11	90.9	4
Magic Johnson	14	6/6/1989	1988-89	NBA Finals	LAL	@	DET	41	17	5	3	0	5	6	12	50.0	0	2	0.0	5	6	83.3	2
Magic Johnson	14	6/21/1988	1987-88	NBA Finals	LAL	vs	DET	40	19	5	2	0	4	6	9	66.7	0	1	0.0	7	8	87.5	5
Magic Johnson	14	6/12/1988	1987-88	NBA Finals	LAL	@	DET	40	18	6	3	0	3	7	8	87.5	0	0		4	5	80.0	2
Dennis Johnson	14	6/9/1987	1986-87	NBA Finals	BOS	vs	LAL	45	15	2	1	1	2	6	15	40.0	0	1	0.0	3	3	100.0	3