Beilul (Ge'ez: በይሉል, romanized: Bäylul, Arabic: بيلول, alternatively, Beylul) formerly known as Baylour is a small cape town in the Southern Red Sea Region of Eritrea.

Beilul was the historical main port ruled by the Kingdom of Dankali and as a point of communication between the Ethiopian Empire with the outside world.

When Massawa was occupied by the Ottoman Empire, the Ethiopian Emperor Fasilides tried to develop a new trade route via Baylul.

His choice fell on Baylul, because this port was beyond the Ottoman sphere of control and directly opposite the harbor of Mocha in Yemen.

Since al-Mu'ayyad Mohammed and his son al-Mutawakkil Isma'il assumed that Fasilides was interested in a conversion to Islam, a Yemeni embassy was sent to Gondar in 1646.