Pieter Dirkszoon Keyser | |
|---|---|
| Born | Unknown date, c. 1540 |
| Died | 11 September 1596 (aged 55–56) Sunda Strait, East Indies |
| Other names | Petrus Theodorus |
| Occupation(s) | Celestial cartographer, navigator |
| Known for | Charting of constellations on the southern celestial hemisphere |
Pieter Dirkszoon Keyser (occasionally Petrus Theodorus; c. 1540 – 11 September 1596) was a Dutch navigator and celestial cartographer who mapped several constellations on the southern celestial hemisphere.