Abdoulaye Ba (born 1 January 1991) is a Senegalese professional footballer who plays for Spanish club Rayo Vallecano as a central defender.
Born in Saint-Louis, Ba joined FC Porto's youth ranks in 2008, aged 17. He spent his first two seasons as a senior on loan to two other Portuguese clubs, S.C. Covilhã in the second division and Académica de Coimbra in the Primeira Liga, making his debut in the latter competition on 15 August 2011 in a 2–1 away win against U.D. Leiria and also playing the full 90 minutes against Sporting Clube de Portugal in the campaign's domestic cup final, which ended 1–0 for the Students.
In September 2012, Porto bought back 25% of Ba's economic rights for €750,000 from investor "Pearl Design Holding Limited", with his value being estimated at €3 million at that time. He made his first league appearance for the Dragons on 2 November of that year, coming on as a substitute for injured Maicon in the first half of an eventual 5–0 home win over C.S. Marítimo.