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Yōsuke "Yōsukezan" Nishijima (西島 洋介, Nishijima Yōsuke, born May 15, 1973) is a Japanese professional boxer who has also competed in kickboxing and mixed martial arts.

Debuting as a professional boxer on March 26, 1992 Nishijima compiled a 24–2–1 record, and over the course of his career, won the WBO NABO Cruiserweight title, the OPBF Cruiserweight title and the World Boxing Federation Cruiserweight title. His last boxing bout, a two-round TKO loss to Cecil McKenzie in a California State Cruiserweight title fight, took place on July 10, 2003.

On February 26, 2006 Nishijima debuted in mixed martial arts, at PRIDE 31, taking on Mark Hunt and losing by KO.

Currently Nishijima's record in mixed martial arts is 0–5 with most recent loss to Melvin Manhoef by TKO, took place on December 31, 2007 at K-1 PREMIUM 2007 Dynamite!!.

In 2009 Nishijima competed in two K-1 style kickboxing bouts. He lost to Peter Aerts by KO due to a right leg kick on August 11, 2009 at the K-1 World Grand Prix 2009 in Tokyo Final 16 Qualifying GP. On New Year's Eve 2009 he fought another K-1 style kickboxing bout when he took on Ray Sefo at Dynamite!! 2009 and lost by unanimous decision. He was not allowed to kick during this match, as he was wearing boxing shoes, which ended up giving him a large disadvantage against the Samoan. His kickboxing record is currently 0–2.

In his retirement match, Nishijima defeated Bob Sapp under kickboxing rules at Legend 4 in Kumamoto, Japan on November 17, 2013, although he was not allowed to kick as he chose to wear boxing shoes. He dropped Sapp with a body shot. Sapp stood back up but he finished the business with body shots followed by couple of right hooks.^[1][2]

23 Wins (15 knockouts, 7 decisions, 1 Disqualification), 2 Losses (1 knockouts, 1 decisions), 1 Draws
Res.	Record	Opponent	Type	Rd.	Date	Location	Notes
Loss	23–2–1	Cecil McKenzie	TKO	2 (10)	10 July 2003	HP Pavilion, San Jose, California	California State Cruiserweight Title, Nishijima down twice in the 2nd
Win	23–1–1	Miguel Aquila	DQ	4	29 March 2002	Radisson Hotel, Sacramento, California
Draw	22–1–1	Darren Whitley	MD	6 (6)	30 November 2001	Hilton Hotel, Reno, Nevada
Win	22–1	Anthony Moore	SD	8 (8)	13 September 1999	Great Western Forum, Inglewood, California
Win	21–1	Ken Hulsey	KO	2 (6)	26 July 1999	Great Western Forum, Inglewood, California
Win	20–1	Ulysses Boulware	KO	5 (6)	21 June 1999	Great Western Forum, Inglewood, California
Win	19–1	Aljenon DeBose	KO	6	22 March 1999	Great Western Forum, Inglewood, California
Win	18–1	Eduardo Ayala	PTS	10 (10)	19 March 1998	Carson, California
Win	17–1	Brian LaSpada	UD	12 (12)	11 July 1997	Tropicana Hotel & Casino, Las Vegas, Nevada	World Boxing Federation cruiserweight title, LaSpada down in the sixth.
Win	16–1	Hussain Shah	TKO	9	07 December, 1996	Tokyo, Japan
Win	15–1	Peter Kinsella	TKO	3 (12)	05 October, 1996	Kyoto, Japan	vacant OPBF cruiserweight title
Win	14–1	Todd McPhee	TKO	3	15 July 1996	Laughlin, Nevada
Win	13–1	Leonardo Aguilar	UD	12 (12)	09 October, 1995	Great Western Forum, Inglewood, California	WBO NABO cruiserweight title
Win	12–1	Krishna Wainwright	KO	9	07 September, 1995	Yokohama, Japan
Win	11–1	Gary Butler	KO	8	27 May 1995	Tokyo, Japan
Win	10–1	John Kiser	SD	12 (12)	19 February 1995	Burbank, California	WBO NABO cruiserweight title
Win	9–1	Keith McMurray	PTS	10 (10)	20 December 1994	Tokyo, Japan
Win	8–1	Andre Sherrod	KO	5	17 October 1994	Osaka, Japan
Win	7–1	Kennedy McCullough	PTS	6 (6)	21 July 1994	Irvine, California
Win	6–1	Jeon Griffin	KO	5	07 March, 1994	Tokyo, Japan
Win	5–1	David Mendez	TKO	4	15 November 1993	Great Western Forum, Inglewood, California
Loss	4–1	Ken Milligan	MD	4 (4)	05 October, 1993	Riviera, Las Vegas, Nevada
Win	4–0	Derrick Edwards	KO	3 (4)	03 August, 1993	Riviera, Las Vegas, Nevada
Win	3–0	Tim Thomas	KO	5	18 March 1993	Tokyo, Japan
Win	2–0	Public Akihiko	KO	3	29 October 1992	Saitama, Japan
Win	1–0	Ron Smith	KO	3	28 March 1992	Tokyo, Japan	Pro debut

Kickboxing record

1 Wins (1 (T)KO's, 0 decisions), 2 Losses
Date	Result	Opponent	Event	Location	Method	Round	Time
2013-11-17	Win	Bob Sapp	Legend 4	Kumamoto, Japan	TKO (Punches)	1	2:36
2009-12-31	Loss	Ray Sefo	Dynamite!! 2009	Saitama, Japan	Decision (Unanimous)	3	3:00
2009-08-11	Loss	Peter Aerts	K-1 World Grand Prix 2009 in Tokyo Final 16 Qualifying GP	Tokyo, Japan	KO (Right Low Kick)	3	1:24
Legend:   Win   Loss   Draw/No contest   Notes

• Professional MMA record for Yosuke Nishijima from Sherdog
• Boxing record for Yōsuke Nishijima from BoxRec (registration required)