Clay Cross (born 26 November 1977 in Sydney) is an Australian shot putter. He won the Australian championships in 1996, 1997, 1999 and 2005.
Cross trained at the Randwick-Botany Little Athletics Club. He attended Waverley College. In 1994, he won the Australian championships in the under-18 category; in the same year, he won silver in the 1994 World School Sport Games; and he was awarded bronze in the 1996 World Junior Championships in Athletics. He trained with Oliver-Sven Buder.
His personal best is 19.42 metres, achieved in June 2004. This result makes him the all-time number one for New South Wales.
His brother Ryan Cross is a rugby league/rugby union player, and his father Paul played rugby league in the 1966 Grand Final.