I only included books published in 2017:
Penny Reid’s Dating-ish is my hands down favorite romance of the year.
Sherry Thomas’s A Conspiracy in Belgravia and Lucy Parker’s Pretty Face are runners-up.
Also of note:
Meredith Duran’s A Lady’s Code of Misconduct
Ainslie Paton’s The Love Experiment
Loretta Chase’s A Duke in Shining Armor