Sitting list MP Parmjeet Parmar will contest the Mt Roskill byelection for National, the party has confirmed.
If she were elected to be the local MP, she would resign from the list and National would get another list MP, Misa Fia Turner.
Parmar was the party's candidate in Mt Roskill in the 2014 election, which Labour's long-serving Phil Goff won with a comfortable majority of 8091.
As a list MP, she established her office and base in the electorate.
Goff resigned from the seat after winning the Auckland mayoralty this month and a byelection will be held on December 3.