The 2017 NatWest T20 Blast was the fifteenth edition of the T20 Blast, a professional domestic T20 competition league in England and Wales run by the ECB.

Ahead of the final round of fixtures, 15 teams were still in a position to qualify for the quarter-finals.

[1] The finals day took place at Edgbaston Cricket Ground in Birmingham on 2 September 2017.

During the group stage (from July to September) each club played six of the other teams in the same division twice, once at a home stadium and once at a home ground of their opponents.

Teams were ranked within their groups by total points, then net run rate.