MY Camelopardalis (MY Cam) is a binary star system located in the Alicante 1 open cluster, some away in the constellation Camelopardalis. It is one of the most massive known binary star systems and a leading candidate for a massive star merger. MY Cam is the brightest star in Alicante 1.
The system consists of two hot blue O-type stars with one component having a mass of 32 solar masses and the other 38 solar masses.
In 1998, the star was included in a list of suspected variable stars. John Greaves and Patrick Wils proved that it is variable, in 2004. It was given its variable star designation, MY Camelopardalis, in 2008. MY Cam is a contact binary and eclipsing binary, with an orbital period of 1.2 days, and an orbital velocity of . Both stars share a common envelope.