Wrestling World 2003 was the title of New Japan Pro Wrestling (NJPW)'s annual start of the year show that takes place on January 4 in the Tokyo Dome each year. Wrestling World 2003 was the twelfth January 4 Dome Show held by NJPW. The show drew 30,000 spectators. The show featured the semi–finals and the finals of the "Young Generation Cup", an NJPW tournament for relative newcomers who have yet to establish themselves as top level wrestlers, which saw Ryushi Yanagisawa defeat Yutaka Yoshie to win the cup. The show featured a total of eleven maches, including a match for the vacant NWF Heavyweight Championship that Yoshihiro Takayama won by defeating Tsuyoshi Kosaka. The main event was a successful defense of the IWGP Heavyweight Championship as champion Yuji Nagata defeated Josh Barnett.

Match results
# Result Stipulation Time
1 Osamu Nishimura defeated Tatsumi Fujinami Singles match 08:10
2 Yutaka Yoshie defeated Shinya Makabe Singles match: semifinal of the Young Generation Cup 13:20
3 Ryushi Yanagisawa defeated Kenzo Suzuki Singles match: semifinal of the Young Generation Cup 09:23
4 Dai Majin and Makai #1 defeated Tatsutoshi Goto and Hiro Saito via disqualification Tag team match 07:50
5 Makai #4 and Makai #5 defeated Takashi Iizuka and Masahito Kakihara – Makai # 5 pinned Iizuka Tag team match 10:54
6 Koji Kanemoto, Jushin Liger and Takehiro Murahama defeated HEAT, Masayuki Naruse and Tiger Mask IV – Kanemoto submitted Naruse Six–man tag team match 16:10
7 Ryushi Yanagisawa defeated Yutaka Yoshie Singles match: Finals of the Young Generation Cup 06:48
8 Shinsuke Nakamura and Michiyoshi Ohara defeated Kazunari Murakami and Tadao Yasuda via referee stoppage Tag team match 07:12
9 Satoshi Kojima and Hiroyoshi Tenzan defeated Masahiro Chono and Manabu Nakanishi Tag team match 23:18
10 Yoshihiro Takayama defeated Tsuyoshi Kosaka Singles match for the vacant NWF Heavyweight Championship 10:19
11 Yuji Nagata (c) defeated Josh Barnett Singles match for the IWGP Heavyweight Championship 10:40
(c) Refers to the champion going into the match
New Japan Pro Wrestling Tokyo Dome Show
NJPW Wrestle Kingdom