Paul Kaine Robertson (born 29 October 1980 in Auckland) is a rugby union player from New Zealand who plays rugby union for Viadana, and international rugby for Italy.
Auckland born Kaine Robertson moved to Italy in 1998, previously he played in the same Auckland Grammar school team as the All Blacks leading try scorer Doug Howlett.
Robertson joined the Viadana and first played for their junior squad; he made his debut for the senior squad on 22 September 2001 at Padua against Petrarca.
Robertson contributed to Viadana's victory in the 2001–02 Italian Championship with 12 tries that made him the Italian seasonal top try scorer; he went on winning two Italian Cups (in 2003 and 2007), and was part of the side that got to the Championship's final in 2008–09, who eventually lost to Benetton Treviso. He was also top try scorer in 2006–07 (9 tries) and 2008–09 (11 tries).
His pace and power made him an immediate hit with his club side Viadana, he contributed to Viadana's victory in the 2001–02 Italian Championship with 12 tries that made him the Italian seasonal top try scorer; and was part of the Viadana side that won two Italian Cups (in 2003 and 2007). He was also top try scorer in the Italian league in 2006–07 (9 tries) and 2008–09 (11 tries).
He joined the inaugural Aironi side for the 2010/11 season, but didn't play until January after suffering an injury in pre season, throughout his time injured he lost his place on the right wing, a place he has held most of the time since his debut.
After Aironi was disbanded in the summer of 2012 Kaine chose to re-join Viadana. Many of his former Aironi team-mates joined the new team Zebre.
Robertson made his Italy debut against Romania in 2004, after becoming eligible through residency, he scored on his debut.
He made his Six Nations debut as a replacement against Ireland in 2005, but it was in 2007 that he had his finest moment in an Italy shirt. Robertson scored one of Italy's four tries against Scotland at Murrayfield to secure Italy's first ever away Six Nations win.
He was selected by then Italy boss Pierre Berbizier for Italy's 2007 World Cup squad, playing in three matches as the Azzurri were knocked out at the group stages.
Robertson was back in action for the 2008 Six Nations, playing in four of five Tests before touring Argentina and South Africa in the summer. He then featured in all three of Italy's autumn internationals as they went down to Australia, Argentina and the Pacific Islanders.
He continued to be a constant member of the Italy side up until 2010.