The 2017–18 CSA Women's Provincial T20 Competition was the 6th edition of South Africa's provincial Twenty20 cricket tournament. It ran from October 2017 to February 2018, with 16 provincial teams taking part. Western Province won the tournament, claiming their fifth T20 title and fourth in a row.^[1]

The 16 teams were divided into three divisions: a top division named "Top 6", and two lower divisions, Pools A and B. Teams played each other team in their group once in a round-robin format, with matches played using a Twenty20 format. The winner of the Top 6 group was crowned Champions.

The tournament ran concurrently with the 2017–18 CSA Women's Provincial League, with matches played either the day before or day after the corresponding encounter between two teams in the one-day tournament. To maintain this link for the following season, promotion and relegation in the Provincial T20 Competition was determined by standings in the Provincial League.^[2]

The groups worked on a points system with positions being based on the total points. Points were awarded as follows:^[3]

Win: 4 points
Tie: 3 points
Loss: 0 points.
Abandoned/No Result: 2 points.
Bonus Point: 1 bonus point available per match.