Deniz Dilmen (born 5 June 2005) is a Turkish professional footballer who plays as a goalkeeper for Süper Lig club İstanbul Başakşehir.
Dilmen is a youth product of Küçükköyspor and Haliç Spor, before moving to İstanbul Başakşehir's youth academy in 2018.
On 2 July 2021, he signed his first professional contract with Başakşehir for 3 seasons.
[1] He debuted with Başakşehir in a 3–2 Süper Lig win over Adana Demirspor on 3 June 2023, becoming their youngest ever goalkeeper to debut.
[2] On 3 August 2023, Dilmen extended his contract with Başakşehir until 2027.