Masaaki Koike
Chunichi Dragons
Outfielder / Coach
Born: (1980-05-15) May 15, 1980 (age 44) Yokohama, Kanagawa, Japan
Batted: Right Threw: Right
NPB debut
April 20, 2001, for the Yokohama BayStars
Last NPB appearance
October 8, 2013, for the Yokohama DeNA BayStars
NPB statistics (through 2013)
Batting average	.243
Hits	415
Home runs	55
RBI	189
Stolen bases	6
Teams
As player Yokohama BayStars/Yokohama DeNA BayStars (1999–2008, 2012–2013) Chunichi Dragons (2008–2011) As coach Yokohama DeNA BayStars (2014–2024) Chunichi Dragons (2025-Present)

Masaaki Koike (小池 正晃, Koike Masaaki, born April 20, 1980 in Yokohama, Kanagawa, Japan) is a professional Japanese baseball player.

Koike played outfield and infield for the Chunichi Dragons (2008–2011) and for the Yokohama DeNA BayStars (2012–2013). Koike announced his retirement on October 1, 2013 and his final at-bat, hit a home run.

In 2014, the Yokohama DeNA BayStars hired Koike as first team batting coach. On 6 November 2024, it was confirmed Koike had accepted an offer to become a hitting coach for the Chunichi Dragons.^[1]

• Career statistics from Baseball Reference (Minors)
• NPB.com