Siyabonga "Tiger" Mangweni (born 20 June 1980) is a South African former rugby union footballer and currently a coach at the Border Bulldogs.

He started his career at the Border Bulldogs and got called into the Stormers Super Rugby squad as a Bulldogs player. He then had a short stint at Western Province, before moving to Griquas, where he also represented the Cheetahs in Super Rugby. In 2008, he moved to the Blue Bulls and also played for the Bulls in Super Rugby.

He was part of the Blue Bulls team who won the 2008 Vodacom Cup title against the Lions.

In 2009, he was a member of the Southern Kings team that played in the 2009 British & Irish Lions tour to South Africa.

In 2010, he was released by the Blue Bulls to join the Eastern Province Kings for the 2010 Currie Cup First Division campaign. He was named in the Southern Kings wider training squad for the 2013 Super Rugby season, but was subsequently released to the Vodacom Cup squad.

He retired as a player at the end of the 2013 season and was appointed the defensive coach for the EP Kings' Vodacom Cup side.