Menelaos Efstathiou (Greek: Μενέλαος Ευσταθίου; born 2 March 1999) is a Cypriot tennis player.

Efstathiou has represented Cyprus in the Davis Cup, where he has a W/L record of 5–6.

Efstathiou reached the quarterfinals of the 2017 Australian Open boys' singles championships.

Efstathiou has a career high ITF junior combined ranking of world No.

This biographical article relating to Cypriot tennis is a stub.