Alexander James "Ali" Williams (born 30 April 1981 in Auckland) is a New Zealand rugby union player at the position of lock. He currently plays for Toulon in the Top 14 League. In 2008, he played for the Crusaders and in 2010 signed on loan for Nottingham in the RFU Championship. He played for the All Blacks between 2002 and 2012. He was in the All Blacks squad for the 2003, 2007 and 2011 World Cups. In 2005, NZ Rugby Almanack chose him as one of its five players of the year.