K Line
| Headquarters in Chiyoda, Tokyo | |
| "K" Line | |
| Company type | Public KK | 
| TYO: 9107 NAG: 9107 FSE: 9107 | |
| Industry | Transport | 
| Founded | 1919 | 
| Founder | Kojiro Matsukata | 
| Headquarters | Uchisaiwaichō, , | 
| Key people | 
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| Subsidiaries | International Transportation Service | 
| Website | www | 
Kawasaki Kisen Kaisha, Ltd. (川崎汽船株式会社, Kawasaki Kisen Kabushiki gaisha, branded as "K" Line) is a Japanese transportation company. It owns a fleet that includes dry cargo ships (bulk carriers), container ships, liquefied natural gas carriers, Ro-Ro ships, tankers, and container terminals. It used to be the fourteenth largest container transportation and shipping company in the world, before becoming part of Ocean Network Express in 2017.