Tolgay Ali Arslan (Turkish pronunciation: ; born 16 August 1990) is a Turkish professional footballer who plays as a midfielder for Fenerbahçe.
Arslan was born and raised in Germany, in Paderborn, to Turkish parents from Çorum; his father, a real estate agent, moved to Germany when he was 11 years old. He began playing football at the age of six, when his father brought him along to watch Grün-Weiß Paderborn play. Arslan began his career with the local club. Patterning his game around Zinedine Zidane and Gheorghe Hagi, Arslan earned a move to Borussia Dortmund in 2003. After several years in Dortmund's youth team, Arslan moved to Hamburger SV.
Arslan moved to Hamburger SV on a free transfer in 2009. He made his debut on 23 September 2009, coming in the 70th minute as a substitute for Marcus Berg in the second round of the DFB-Pokal against Osnabrück. Hamburg managed a 3–3 draw, but went on to lose 5–7 following a penalty shootout. Arslan made his league debut on 17 October 2009 in a 0–0 draw against Bayer Leverkusen.