This was after the new moon marking the end of the month of Ramadhan was sighted in various parts of the country last night including Coast and North Eastern regions. Muslims follow the lunar calendar, not the solar one.
Local sightings of the moon can differ, which is why there can be discrepancies between the days different countries start and end their fast.
Eid is celebrated by family and friends getting together and many will also attend special Eid prayers in the morning.
The most common greeting to say to Muslims is Eid Mubarak.
Ramadan is the ninth month in the Islamic calendar, which is determined by the lunar cycle.
Similarly when determining the last day of Ramadan, if the new moon is sighted the holy month is complete and Eid is celebrated the following day.
In Sir Ali Muslim Club in Nairobi, where thousands of Muslims in flowing robes and dresses gathered for prayers, the overriding message was for Muslims to play their part in enhancing peace and socioeconomic development of the country.
Photos by Elvis Ogina, Joseph Kipsang, Omondi Onyango and Kibata Kihu