Petra Kvitova celebrates
Image credit: Getty Images
Rybarikova won a tight opening set, but could not match her opponent after that as Kvitova roared back.
The Czech lost just three games thereafter as she raced through the second and third sets.
"It's amazing to defend a title," Kvitova said courtside. "It's not happened in a long time for me.
"I was too nervous and Magda put pressure on me in the first set. It was tough to fightback but I was relaxed and it paid off afterwards.
"I'm going to Eastbourne (this week) for another tournament. We'll see how it goes from there... but for sure Wimbledon is the next big one for us."
Czech Republic’s Petra Kvitova celebrates in Birmingham
Image credit: Reuters
Kvitova, who won Wimbledon in 2011 and 2014, is one of the favourites to take a third title at SW19.
The 28-year-old is currently ranked at number eight in the world and was seeded fourth in Birmingham.