Masaki Morinaga (森長 正樹 Morinaga Masaki) (born March 27, 1972) is a retired male long jumper from Japan.
| Year | Competition | Venue | Position | Notes |
|---|---|---|---|---|
| Representing Japan | ||||
| 1991 | Asian Championships | Kuala Lumpur, Malaysia | 2nd | Long Jump |
| 1997 | East Asian Games | Busan, South Korea | 1st | 8.13 m |
| World Championships | Athens, Greece | 9th | Long Jump | |
| 1998 | Asian Games | Bangkok, Thailand | 1st | Long Jump |
| IAAF World Cup | Johannesburg, South Africa | 6th | Long Jump | |
| Asian Championships | Fukuoka, Japan | 1st | Long Jump | |
| 1999 | World Indoor Championships | Maebashi, Japan | 7th | Long Jump |
| 2000 | Olympic Games | Sydney, Australia | 21st | Long Jump |
| 2001 | East Asian Games | Osaka, Japan | 2nd | Long Jump |
| 2002 | Asian Championships | Colombo, Sri Lanka | 5th | Long Jump |