| Party: | New National Party National Party |
| Office1: | Member of the National Assembly |
| Termstart1: | May 1994 |
| Termend1: | April 2004 |
| Citizenship: | South Africa |
| Birth Date: | 19 September 1936 |
| Birth Name: | Johannes Jacobus Niemann |
| Constituency1: | Northern Cape |
Johannes Jacobus "Keppies" Niemann (born 19 September 1936)[1] is a retired South African politician. He represented the National Party (NP) and New National Party (NNP) in the National Assembly from 1994 to 2004, gaining election in 1994[2] and 1999. He represented the Northern Cape constituency. When the NNP joined the Democratic Alliance in 2000, he was appointed as the alliance's spokesman on transport.[3]
Niemann left Parliament after the 2004 general election.[4] He formerly represented the NP in the apartheid-era House of Assembly, and at the time of his departure in 2004 he was considered by News24 to be "the most senior member of the party in a public position".