Boulter, who beat Emma Raducanu and Karolina Pliskova back-to-back last year to defend her Nottingham title, begins her title defence against Lulu Sun.
She is joined this year by Kartal, who has had a rapid rise up the rankings after clinching her maiden WTA Tour title last September.
Teenager Hannah Klugman, one of the most highly-rated British juniors, has been given a main-draw wildcard and will start against fourth seed Yulia Putintseva.
Britons Harriet Dart and Francesca Jones will play each other in the first round, while fellow wildcard Mingge Xu faces Katie Volynets.
Two-time Wimbledon champion Petra Kvitova will also feature, having used her protected ranking to enter the draw as she continues her return from maternity leave.
Brazil’s Beatriz Haddad Maia, who won the event in 2022, is also included, as is 2012 US Open runner-up Leylah Fernandez and last year’s Wimbledon quarter-finalist Sun.