He secured a total of 43,208 votes, with Labour candidate Julie Jackson coming second with 35,108.
Mr Seccombe, who is Ettington Ward councillor on Stratford District Council, will begin his new job on 12 May.
He replaces Ron Ball, who announced last year he would not stand for re-election.
Congratulating his successor, Mr Ball said: "I have no doubt that he will find the job as rewarding and enjoyable as I have and I wish him the very best for the next four years."
The turnout across Warwickshire was 26.73%, with 111,900 total votes cast.
Candidates are listed alphabetically by surname. BBC News App users: tap here to see the results.
More information is available on the Choose my PCC website.
Conservative Philip Seccombe is Warwickshire's new police and crime commissioner.