Robert Julius Trumpler | |
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| Born | Robert Julius Trümpler October 2, 1886 |
| Died | September 10, 1956 (aged 69) |
| Citizenship | Swiss · American |
| Education | Universität Zürich University of Göttingen (PhD) |
| Employer(s) | University of California Allegheny Observatory Lick Observatory |
| Organization | United States National Academy of Sciences |
| Known for | Galactic cluster Trumpler classification |
Robert Julius Trumpler (October 2, 1886 – September 10, 1956) was a Swiss-American astronomer.