Tennis or Tinnīs (Egyptian Arabic: تنيس, Coptic: ⲑⲉⲛⲛⲉⲥⲓ[1]) was a medieval city in Egypt which no longer exists.

[3] Tinnis was an important port, exporting agricultural products of Egypt, particularly textiles, of which itself is famed for producing[4] throughout the Middle East, due to its geographical location served by the main eastern tributary of the Nile in medieval times, according to Muhammad al-Idrisi.

The lake allowed for boats to wait out rough conditions unlike at Damietta or Rashid where the Nile empties directly into the sea, which made it a "port of the lands of Byzantium, the Frankish periphery, Cyprus, the whole length of the Levant coast and the entrepôts of Iraq" according to Ibn Zulaq.

[5] The 11th-century traveller Nasir Khusraw, who visited the city during the Fatimid Caliphate, reported that it was densely populated, with 50,000 inhabitants, 10,000 shops and two large Friday mosques.

Some of the birds that were caught included bats, robins, turtledoves, cranes, Egyptian vultures, geese, crows, owls, duck, and pelicans.

The people of Tinnīs primarily practiced Islam, with 167 prayer areas and mosques with minarets reported around the city.

In 1192–93 Saladin ordered the abandonment of the civic settlement, leaving only a military fort whilst commerce was moved to the more defensible port of Damietta.