Diouf married his girlfriend of four years, Maria Orten, in Molde on 2 July 2011. Diouf went missing for a few days before the wedding, with his fiancée blaming his disappearance on the best man, Molde FK midfielder Pape Paté Diouf. He eventually turned up on 30 June, but Orten was forbidden from revealing the reason for his absence. His brother Mame Mbar Diouf is also a footballer who has played for Molde, Sarpsborg 08 and TSG Neustrelitz. Diouf's mother, Gnilane, died during the 2015 Mina stampede in Saudi Arabia, while his sister survived with small injuries.