Passer is a genus of sparrows, also known as the true sparrows. The genus contains 28 species and includes the house sparrow and the Eurasian tree sparrow, two of the most common birds in the world. They are small birds with thick bills for eating seeds, and are mostly coloured grey or brown. Native to the Old World, some species have been introduced throughout the world.

पैसर (Passer) गौरैया पक्षियों का एक जीववैज्ञानिक वंश है। इसकी सदस्य जातियों में घरेलू गौरैया सम्मिलित है, जो विश्व की सर्वाधिक संख्या रखने वाले पक्षियों में से एक है।