Closest challengers Spurs, Arsenal, Manchester City, Manchester United and last year's champions Chelsea, have all failed to match the Foxes' consistency across the season.
After Leicester drew 1-1 at Manchester United on Sunday, Tottenham needed to win all three of their remaining league games to catch the Foxes.
But their title hopes were ended when they squandered a 2-0 lead to only draw at London rivals Chelsea.
It is Leicester's first top-flight title and the club, owned by Thai billionaire businessman Vichai Srivaddhanaprabha, have also qualified for next season's Champions League group stages for the first time.
The Foxes started the season among the favourites for relegation and only the three promoted sides - Watford, Norwich and Bournemouth - were longer odds for the league title.
Ranieri, who took over from the sacked Nigel Pearson in the summer, was seen as an uninspired choice by some fans and pundits after his predecessor had overseen a run of seven wins in nine games as Leicester escaped relegation in 2014-15.
The Italian's previous job ended abruptly when his Greece side lost to European minnows Faroe Islands during Euro 2016 qualifying.
Yet the charismatic 64-year-old's side - assembled for less than £30m and playing pacey, direct, counter-attacking football - has confounded the experts.

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