'It has been a unique year'
Bonmati succeeds her international teammate Alexia Putellas as winner of the prize after inspiring Spain to glory at the Women's World Cup in Australia and New Zealand earlier this year.
Bonmati also starred as Barcelona won the Champions League last season and was recently named as the UEFA Women's Player of the Year.
"It is difficult to improve on this. It has been a unique year," she told various media including 'AFP'.
"If anyone said to me when I was little that I would play at the Camp Nou, win the World Cup, two Champions Leagues, a Ballon d'Or, a UEFA award, these are extraordinary things."
She was one of four members of the triumphant Spain team to feature among the 30 nominees, with Alba Redondo, Salma Paralluelo and full-back Olga Carmona, who netted the winner in the final, all shortlisted.
Last year's Ballon d'Or winner Alexia Putellas, also part of that Spain side, was not nominated after missing almost all of last season with a knee injury.
Australia's Sam Kerr came second with Paralluelo in third place. Putellas had won the Ballon d'Or in each of the previous two campaigns. Norway's Ada Hegerberg won the inaugural award in 2018 and USA star Megan Rapinoe succeeded her a year later.