John Commingers Ainsworth | |
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| Born | June 6, 1822 |
| Died | December 30, 1893 (aged 71) near Oakland, California |
| Occupation(s) | businessman and steamboat owner |
| Known for | founded Oregon Steam Navigation Company |
John Commingers Ainsworth (June 6, 1822 – December 30, 1893) was an American pioneer businessman and steamboat owner in Oregon. A native of Ohio, he moved west to mine gold in California before immigrating to Oregon where he piloted steamships and became a founder of the Oregon Steam Navigation Company and several banks.