William L. Harkness | |
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| Born | August 8, 1858 Bellevue, Ohio, U.S. |
| Died | May 10, 1919 (aged 60) New Hyde Park, New York, U.S. |
| Resting place | Woodlawn Cemetery |
| Education | Yale University (Class of 1881) |
| Occupation(s) | Business investor, heir |
| Spouse | Edith Hale |
| Children | Louise Hale Harkness (1898-1978), William Hale Harkness (1900–1954) |
| Parent(s) | Daniel M. Harkness and Isabella Harkness |
William Lamon Harkness (August 8, 1858 – May 10, 1919) was an American businessman and inheritor of a large share of Standard Oil.