Esure Group plc (stylised as esure) is an Internet and telephone based insurance company based in Reigate, Surrey, England. It also has offices in Manchester and Glasgow.

Esure was founded in 2000 by businessman Peter Wood, who also launched the Direct Line insurance company for the Royal Bank of Scotland.

Esure is also known for its high-profile commercials with Michael Winner, used from 2002 to 2005 and resuming in 2007. The adverts spawned the phrase, "Calm down dear, it's a commercial".

In 2007, it was announced that Esure would replace E.ON as the sponsor of ITV National Weather bulletins. The two-year deal, rumoured to be worth £10 million, was negotiated by Carat Sponsorship and began on 1 January 2008.

On 11 February 2010, Lloyds Banking Group sold its 70% stake in the firm to a company led by Wood, Esure Group Holdings, in a deal valued at £185 million. On December 8, 2014, Esure announced that it was acquiring the remaining 50% of shares in financial comparison website Gocompare.com having previously secured a non-controlling stake in the company.

In August 2018, two years after demerging Gocompare.com again, it agreed to be acquired by Bain Capital; the takeover was sanctioned by the High Court in December. This transaction ends a five-year period in which Esure was listed on the London Stock Exchange.

In April 2025, five years after Andy Haste replaced Wood as chairman of Esure, it was announced that Bain Capital had agreed to sell the company for €1.510bn to Ageas. On 30 September, it was announced that the transaction had been completed.

Esure offers motor insurance, home insurance and travel insurance. The company focuses on lower risk customers, offering cheaper premiums for customers with a current no claims bonus for its car insurance products. Esure car insurance also incorporates the First Alternative brand which in the past offered quotes to higher risk customers as a separately authorised insurer but now sits as a small-scale sub-brand of Esure.