Niell Jacobs (born 30 June 1988) is a South African rugby union player, currently playing with the Border Bulldogs. His regular position is centre or fly-half. He is the twin brother of Ruan Jacobs.
He represented the Blue Bulls at the 2006 Under–18 Academy Week before moving to Bloemfontein, where he represented the Free State Cheetahs in the Under-19 Provincial Championship competition in 2007 and the Under-21 Provincial Championship competition in 2007, 2008 and 2009. He also represented local university side, the UFS Shimlas in the 2009 Varsity Cup, scoring 60 points to put him fifth in the scoring charts.
He never represented the Free State Cheetahs in senior rugby. Instead he moved to Potchefstroom, where he played for the Leopards, making his senior debut for them in the 2009 Currie Cup Premier Division in a match against the Sharks.
He made several appearances for them over the next two seasons and also represented NWU Pukke in the 2011 Varsity Cup.
However, he failed to establish himself in the first team and in 2012, he – along with twin brother Ruan – signed for East London-based side the Border Bulldogs.