| Office: | Justice of the Constitutional Court |
| Term Start: | 1 December 2015 (Acting: January 2013 – December 2013) |
| Appointer: | Jacob Zuma |
| Predecessor: | Thembile Skweyiya |
| Term End3: | 2015 |
| Office2: | Judge of the Supreme Court of Appeal |
| Appointer2: | Kgalema Motlanthe |
| Office4: | Judge of the High Court |
| Term Start4: | 1 June 2002 |
| Term End4: | 30 November 2008 |
| 1Blankname4: | Division |
| 1Namedata4: | Eastern Cape |
| Appointer4: | Thabo Mbeki |
| Birth Date: | 1964 5, df=yes |
| Birth Place: | Port Elizabeth, South Africa |
| Birth Name: | Nonkosi Zoliswa Mhlantla |
| Alma Mater: | University of the North |
| Termstart2: | 1 December 2008 |
| Termend2: | 30 November 2015 |
| Honorific Prefix: | The Honourable |
Nonkosi Zoliswa Mhlantla (born 2 May 1964) is a South African judge of the Constitutional Court. Elevated to that court in December 2015, she was formerly a judge of the Supreme Court of Appeal between December 2008 and November 2015. She entered legal practice as an attorney in her hometown, Port Elizabeth, and joined the bench in June 2002, becoming the first woman ever to be appointed to the Eastern Cape Division of the High Court of South Africa.
Mhlantla was born on 2 May 1964 in Port Elizabeth in the Eastern Cape.[1] She grew up in the Port Elizabeth townships of KwaZakhele and New Brighton.[2] In 1982, she matriculated at Kenneth Masekela High School in KwaThema, a township outside Springs in the former Transvaal, and she went on to the University of the North, where she completed a BProc in 1987.
Between 1990 and 2002, she practised as an attorney in Port Elizabeth, running her own firm named N. Mhlantla & Associates. As a junior attorney, she handled some criminal matters, including Apartheid-era political trials, but she focused primarily on civil, labour, and arbitration matters.[3] During this period, she served briefly as an acting judge in the High Court of South Africa, filling a vacancy in the Eastern Cape Division between April and September 2000; she also served as a commissioner in Small Claims Court.
Mhlantla was appointed permanently to the Eastern Cape High Court on 1 June 2002. She was the first woman to be appointed to that bench in its 138-year history. Towards the end of her six-year tenure in the High Court, from June 2007 to November 2008, she was seconded as an acting judge to the Supreme Court of Appeal.
In August 2008, Mhlantla was shortlisted as one of several candidates to fill one of two permanent vacancies in the Supreme Court of Appeal.[4] She was appointed by President Kgalema Motlanthe later that year.[5] Throughout 2013, she served as an acting judge in the Constitutional Court of South Africa,[6] during absences by Justice Edwin Cameron, Justice Johann van der Westhuizen, and Chief Justice Mogoeng Mogoeng.[7] [8] During that period, she wrote several majority judgements for the Constitutional Court.
In June 2015, the Judicial Service Commission announced that Mhlantla was one of four candidates who had been shortlisted for possible appointment to fill a permanent vacancy on the Constitutional Court.[9] The seat had formerly belonged to retired Justice Thembile Skweyiya, and commentators had criticised the delay in appointing Skweyiya's replacement.[10] The other candidates were also women – Dhaya Pillay, Leona Theron, and Zukisa Tshiqi – but Mhantla was the most experienced among them.[11] She was nominated to the position by the National Association for Democratic Lawyers, of which was a founding member, and she was viewed as "a safe choice on the constitutional interpretation front", given her record of moderate judgements. Her interview took place in July in Johannesburg.[12]
On 9 November 2015, President Jacob Zuma announced that he would appoint Mhlantla to the Constitutional Court bench, with effect from 1 December.[13] When Justice Sisi Khampepe retired in 2021, she became the longest-serving woman in the Constitutional Court.[14]
Mhlantla is a single mother to an adult daughter.