Mr Ablewhite received 81,581 votes. His nearest challenger was Labour's Dave Baigent, who polled 72,480.
Nick Clarke from UKIP came third with 29,698 votes.
Mr Ablewhite, a former food industry senior manager, retired in 2015 to concentrate on politics. He has been a councillor in St Ives, where he lives, since 2005.
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Results after the second round of votes:
More information is available on the Choose my PCC website.
Results after the first round of votes:
Conservative Jason Ablewhite is the new Police and Crime Commissioner for Cambridgeshire.