X is an Australian punk rock band with a cult following, formed in Sydney in 1977 and led by the late Ian Rilen. The band has split and reformed several times.
Although X has had several members, its sound has been defined by two distinctive elements: Rilen's loud, powerful basslines and Steve Lucas's guitar floating on top of the mix. Drummer Cathy Green has also been a frequent member of the band since 1984.
Rilen was also a founder member of bluesy hard rockers Rose Tattoo. During X's first hiatus (1980-83), he formed the hard-working post punk outfit Sardine v, with his then wife, Stephanie Rilen. As of 2004, Rilen had settled on a fairly stable line up of his current project, Ian Rilen & the Love Addicts, who include Cathy Green on bass. The band have also issued a CD, "Passion Boots & Bruises."

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