| Wataru Karashima | |
| Position: | Pitcher |
| Team: | Tohoku Rakuten Golden Eagles |
| Number: | 58 |
| Birth Date: | 18 October 1990 |
| Bats: | Left |
| Throws: | Left |
| Debutleague: | NPB |
| Debutdate: | August 13 |
| Debutyear: | 2009 |
| Debutteam: | Tohoku Rakuten Golden Eagles |
| Statyear: | 2023 season |
| Stat1label: | Win–loss |
| Stat1value: | 56-72 |
| Stat2label: | ERA |
| Stat2value: | 3.97 |
| Stat3label: | Strikeouts |
| Stat3value: | 700 |
| Stat4label: | Saves |
| Stat4value: | 2 |
| Stat5label: | Holds |
| Stat5value: | 10 |
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Wataru Karashima (辛島 航, born October 18, 1990, in Fukuoka, Fukuoka) is a Japanese professional baseball pitcher for the Tohoku Rakuten Golden Eagles in Japan's Nippon Professional Baseball.