Defunct Bright Blue is an independent centre-right think tank and pressure group with a mission statement of defending and improving liberal society, based in the United Kingdom.

Founded in 2014 by British thinker Ryan Shorthouse,[1] Bright Blue aims to "defend and champion liberal, open, democratic and meritocratic values, institutions and policies.

[10] The think tank describes its guiding ideas as: optimism about human potential; evidence not ideology; pro-market not free-market; social justice; rewarding contribution; individual success and communal responsibility; open and integrated societies; the importance of institutions; positivity about politics; and citizen power.

[13] The think tank has worked extensively with multiple various intellectuals and members of parliament,[14] including Simon Hoare, Liam Byrne, James Cleverly, Patricia Hewitt, Robert Jenrick, Carmen Smith, Laura Trott, Jerome Mayhew, Kevin Hollinrake, Wera Hobhouse, Emily Darlington, Bill Esterson, Sajid Javid, Tom Tugendhat, Robert Buckland, David Willetts, Andrew Mitchell, Laura Sandys or Matthew Parris.

In November 2022, Ryan Shorthouse announced that he would stand down as Director of Bright Blue and step up to chair the organisation, criticizing the Conservative government for having "failed millennials" and citing disagreements over housebuilding policies and soaring childcare costs.

In the past, its printed magazine has featured contributors such as Tim Yeo, Ben Goldsmith, Suella Braverman, Priti Patel, Frances O'Grady, Chris Grayling, John Hayes, Madeleine Sumption, Paul Blomfield, Vernon Bogdanor, John Curtice, Philippe Legrain, David Blanchflower, Matt Hancock, Vicky Ford, Alan Mak, Nigel Huddleston, Steve Hilton, Paul Goodman, Ed Vaizey, Flick Drummond, Angus Maude, Justine Greening, Nicky Morgan, Douglas Carswell, Jacob Rees-Mogg, Michael Heseltine, Damian Collins, Tracey Crouch, Sam Gyimah, Tim Loughton, Roger Scruton, Nick Gibb, Kwasi Kwarteng, Dehenna Davison, Neil O'Brien, Ben Houchen, Michael Kenny, Rory Stewart, Jesse Norman, Peter Hitchens, Victoria Atkins, Susan Hall, Alicia Kearns, Matt Warman, Tobias Ellwood, Grant Shapps, and Ed Davey, amongst others.