| Named By: | O. V. Mateus, P. D. Mannion & P. Upchurch in 2014 |
| Time Period: | Late Jurassic |
| Location: | Portugal - Lourinha Formation |
| Size: | Currently unknown due to lack of fossil remains |
| Diet: | Herbivore |
| Fossil(s): | Partial postcranial remains |
| Classification: | | Chordata | Reptilia | Dinosauria | Saurischia | Sauropoda | Turiasauira | |
Zby is an extinct genus of turiasaurian sauropod dinosaur known from the Late Jurassic (late Kimmeridgian stage) of the Lourinha Formation, central west Portugal. It contains a single species, Zby atlanticus. It is named after Georges Zbyszewski, who studied the geology and paleontology of Portugal.