Kvitova has not dropped a set this week, and recorded a fifth consecutive quarter-final win this season.
Up next, for Kvitova is Romania's Mihaela Buzarnescu, who produced one of her finest grasscourt performances to put away second seed Elina Svitolina 6-3 6-2.
Svitolina made 25 unforced errors, allowing Buzarnescu to capitalise with a pair of break points in each set to book a place in her first-ever Premier-level semi-final in just her second grass tournament at WTA level.
"I'm so happy with my game today. I really managed to focus and play well," Buzarnescu said after the match.
"It's really been an amazing two weeks I've had, having played so little in the grass in my career."
Earlier in the day, 2009 winner Magdalena Rybarikova and two-time runner-up Barbora Strycova set up an intriguing semi-final clash after the pair collected convincing victories.
Rybarikova ended the run of Slovenian qualifier Dalila Jakupovic 6-2 6-4, while Strycova progressed after her opponent Lesia Tsurenko was forced to retire with an injury, trailing 7-5 3-0.
(Reporting by Hardik Vyas in Bengaluru; Editing by Peter Graff)
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