Third sector may refer to:
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.