I didn't find anything for this season, but Pascal Siakam had the highest plus/minus in the 2025 playoffs, at +36 in the first half versus the Cavaliers on May 11.

Interpreted as:

most +/- by a player in a half this playoffs

	NAME	+/-	HALF	DATE	TM		OPP	MIN	PTS	REB	AST	STL	BLK	FGM	FGA	FG%	3PM	3PA	3P%	FTM	FTA	FT%	TS%	OREB	DREB	TOV	PF
1	Pascal Siakam P. Siakam	+36	1H	5/11/2025	IND	vs	CLE	13	12	3	3	1	0	5	6	83.3	2	2	100.0	0	0		100.0	0	3	1	2
2	Shai Gilgeous-Alexander S. Gilgeous-Alexander	+34	1H	5/7/2025	OKC	vs	DEN	18	18	2	7	0	0	6	8	75.0	1	2	50.0	5	5	100.0	88.2	1	1	1	2
3	Tyrese Haliburton T. Haliburton	+33	1H	5/11/2025	IND	vs	CLE	16	11	5	4	0	0	3	6	50.0	1	3	33.3	4	5	80.0	67.1	0	5	1	1
4	Jarrett Allen J. Allen	+33	1H	4/28/2025	CLE	@	MIA	17	12	11	1	6	0	4	4	100.0	0	0		4	4	100.0	104.2	3	8	0	1
5	Jayson Tatum J. Tatum	+32	2H	4/29/2025	BOS	vs	ORL	15	19	5	4	1	0	4	7	57.1	4	5	80.0	7	7	100.0	94.2	0	5	0	0
6	Payton Pritchard P. Pritchard	+32	2H	4/29/2025	BOS	vs	ORL	16	8	2	1	0	0	3	5	60.0	2	2	100.0	0	0		80.0	1	1	1	2
7	Myles Turner M. Turner	+31	1H	5/11/2025	IND	vs	CLE	16	18	5	2	0	0	7	11	63.6	4	4	100.0	0	1	0.0	78.7	3	2	0	0
8	Giannis Antetokounmpo G. Antetokounmpo	+31	2H	4/25/2025	MIL	vs	IND	17	20	4	4	1	0	7	10	70.0	0	0		6	6	100.0	79.1	1	3	3	0
9	Jalen Williams J. Williams	+30	2H	4/24/2025	OKC	@	MEM	21	8	3	5	1	1	2	6	33.3	1	3	33.3	3	4	75.0	51.5	0	3	1	1
10	Alex Caruso A. Caruso	+30	1H	4/20/2025	OKC	vs	MEM	12	0	3	4	0	0	0	0		0	0		0	0			0	3	0	0
11	Andrew Nembhard A. Nembhard	+29	1H	5/11/2025	IND	vs	CLE	21	5	2	5	2	0	2	4	50.0	1	1	100.0	0	0		62.5	1	1	0	0
12	Max Strus M. Strus	+29	1H	5/9/2025	CLE	@	IND	17	13	6	3	0	1	5	8	62.5	3	6	50.0	0	0		81.3	2	4	0	2
13	Amen Thompson A. Thompson	+29	1H	4/30/2025	HOU	vs	GSW	17	11	1	2	5	1	3	6	50.0	0	0		5	6	83.3	63.7	1	0	3	1
14	Gary Trent Jr. G. Trent Jr.	+29	2H	4/25/2025	MIL	vs	IND	16	24	0	0	2	0	7	9	77.8	7	8	87.5	3	4	75.0	111.5	0	0	0	0
15	Julius Randle J. Randle	+28	1H	5/24/2025	MIN	vs	OKC	19	10	3	3	0	0	4	8	50.0	0	2	0.0	2	2	100.0	56.3	0	3	0	1
16	Jarrett Allen J. Allen	+28	1H	5/9/2025	CLE	@	IND	16	13	6	2	0	1	4	7	57.1	0	0		5	6	83.3	67.4	3	3	1	2
17	Al Horford A. Horford	+28	2H	4/29/2025	BOS	vs	ORL	16	5	5	2	1	1	2	2	100.0	1	1	100.0	0	0		125.0	0	5	0	0
18	Max Strus M. Strus	+28	1H	4/28/2025	CLE	@	MIA	15	3	4	2	1	0	1	6	16.7	1	4	25.0	0	0		25.0	0	4	2	0
19	Jalen Williams J. Williams	+28	1H	4/20/2025	OKC	vs	MEM	18	14	1	5	3	0	7	12	58.3	0	3	0.0	0	0		58.3	0	1	2	1
20	Donovan Mitchell D. Mitchell	+27	1H	5/9/2025	CLE	@	IND	19	17	5	3	0	0	7	15	46.7	2	5	40.0	1	2	50.0	53.5	2	3	2	2
21	Ty Jerome T. Jerome	+27	1H	4/26/2025	CLE	@	MIA	11	4	2	7	2	0	2	7	28.6	0	2	0.0	0	0		28.6	1	1	0	0
22	Luguentz Dort L. Dort	+27	2H	4/24/2025	OKC	@	MEM	19	2	4	0	1	1	1	2	50.0	0	1	0.0	0	2	0.0	34.7	1	3	0	2
23	Chet Holmgren C. Holmgren	+27	2H	4/24/2025	OKC	@	MEM	19	23	5	0	0	0	8	12	66.7	5	8	62.5	2	2	100.0	89.3	1	4	0	1
24	Cason Wallace C. Wallace	+27	1H	4/20/2025	OKC	vs	MEM	10	2	1	1	1	0	1	1	100.0	0	0		0	0		100.0	0	1	1	3
25	Jalen Williams J. Williams	+26	1H	5/28/2025	OKC	vs	MIN	17	15	6	2	1	0	5	9	55.6	1	3	33.3	4	5	80.0	67.0	0	6	2	0