Third Sector is a British publication that covers the management of the voluntary and not-for-profit sector. It is run by the Haymarket Group, currently publishing a monthly magazine, alongside a website and also organising events.
It launched in 2002, going head-to-head with another new title, Charity Week.
The magazine was given a new look in 2009, following an exercise to take account of reader feedback. In 2011, the magazine had a circulation of almost 11,500 per issue. By 2014 the print circulation had dropped to just over 6,200 per issue.
In 2015 the magazine launched an event called "Fundraising Week". The following year this was a 3-day event held in London and incorporated an award ceremony.