Maad a Sinig Mahecor Joof (English spelling in the Gambia; variations: Maad a Sinig Mahécor Diouf - French in Senegal; Maad Siin or Mad a Sinig Mahekor Juuf, also Maye Koor Juuf - in Serer-Sine language[1]) was the last king to rule the Serer Kingdom of Sine, now part of independent Senegal.

Maad a Sinig means king of Sine in the Serer language.

[4] By 1969, Maad Mahecor Joof although retired, was the only ruler in Senegal who possessed real power.

The Maad a Sinig (King of Sine) was very committed in the preservation of Serer culture and tradition.

He performed the traditional role of the Maad a Sinig, presiding over the religious affairs of his subjects and became the focal point of the Sine-Sine (inhabitants of Sine).