Alastair Cook, who played seven matches in Essex’s Division Two title triumph, averaged 91.86 to underline his value to the club.
Having come through the County Championship side’s academy set-up, the 31-year-old said he had no hesitation in extending his stay.
“It was an easy decision to sign with the club for another year,” he told the club’s official website.
“Although I am away with England a lot, this club means a lot to me and I am grateful for the opportunity they gave me as a youngster.
“I love coming back to the club when I can and contributing to a title-winning season meant a great deal.”