Sélibaby () is a capital town and department of the Guidimaka Region, in Mauritania. It is located at around .
It is divided into a number of "quartiers" which include "College", "Silo", 'Ferlo", "Nezaha", "Saada", "El Jedidah", "Bambaradougou" amongst many others.
Selibaby also has a regional Hospital, funded by the Chinese government and partially staffed by Chinese doctors and is the headquarters of the regional director of health.
Selibaby is also a center for NGOs who operate in the region.
Climate.
Sélibaby has a hot semi-arid climate (Köppen "BSh"). The city is among the wettest in the country due to its significant exposure to the West African Monsoon, with about of precipitation falling annually. The average annual temperature in Sélibaby is .