Ilia Iliev Gruev (born 6 May 2000) is a Bulgarian footballer who plays as a midfielder for Werder Bremen.
Gruev made his professional debut for Werder Bremen in the second round of the 2020–21 DFB-Pokal on 23 December 2020, coming on as a substitute in the 87th minute for Jean-Manuel Mbom against Hannover 96. The away match finished as a 3–0 win for Bremen.
Gruev has appeared for the Bulgaria under-17, under-18 and under-19 national teams.
Gruev was born in Sofia, but also holds German citizenship. He is the son of Iliya Gruev, former Bulgarian international footballer and manager.