NAB will continue to be the naming rights partner of the NAB AFL Women's competition until 2022.
The announcement on International Women's Day will mean NAB will have been the naming rights partner of the AFLW for all five years of the competition by the end of the arrangement.
NAB is also a naming rights partner of the AFL Auskick and the AFL and AFLW Rising Star programs.
"We enjoy a genuine partnership with NAB, who have supported the AFL in bringing the NAB AFL Women's competition to life since its inaugural season in 2017, and we're so pleased they will continue with us for another three years," AFL general manager of commercial Kylie Rogers said.
NAB chief customer experience officer Rachel Slade said the company was proud to be supporting both men and women's football.
"We are committed to growing the game at all levels and making it a better game for all Australians. That's why we support programs that help take Aussie kids from the local footy oval to the elite level," she said.
"The AFLW is a powerful example of how NAB is supporting community initiatives to advance gender equality. Each AFLW game brings much-needed awareness that competitive football is a game for both men and women."