Barnabas Sibusiso Dlamini (born 15 May 1942) is Prime Minister of Swaziland. He was Prime Minister from 1996 to 2003 and has held the position again since October 2008.
Dlamini was Minister of Finance from 1984 to 1993. He was also an executive director of the International Monetary Fund (IMF). From 1996 to 2003, he was Prime Minister, and in 2003 he became a member of King Mswati III's advisory council.