Lina Qostal (; born 11 March 1997) is a Moroccan tennis player.
Qostal has won one doubles title on the ITF Women's Circuit in her career. On 10 November 2014, she reached her best doubles ranking of world No. 792.
Qostal made her WTA Tour debut at the 2013 Grand Prix SAR La Princesse Lalla Meryem, having been awarded a wildcard into both the singles and doubles draws. In singles, she was drawn against Karin Knapp and was beaten by the Italian in their first-round encounter. She partnered with Alizé Lim in the doubles event but fared no better there, ultimately losing to Sandra Klemenschits and Andreja Klepaàin the first round.
Qostal was born in Rabat. In 2018 she graduated from the University of Pennsylvania, where she was enrolled in the College of Arts and Sciences, and was a member of the women's varsity tennis team. Qostal previously studied at Lycée Descartes in the capital city of Morocco, Rabat.
Playing for Morocco Fed Cup team, Qostal has a winâÂÂloss record of 10âÂÂ3 in Fed Cup competition.