Muslims from all walks of life made a beeline for Eidgahs (prayer ground) and mosques for offering the Eid prayers.
In Lucknow, women offered 'namaaz' at Aishbagh Eidgah for the first time.
Governor Ram Naik and UP Chief Minister Akhilesh Yadav greeted people on the occasion at Eidgah.
Ramzan, the ninth month of the Islamic lunar calendar, is observed as a fasting period by Muslims the world over who abstain from taking food and water during the period extending from 30 minutes before the sunrise to sunset.