Theos (from the Greek: Θεός, theós, "God") is a Christian religion and society think tank researching the relationship between religion, politics and society in the contemporary world. Theos aims to impact opinion around issues of faith and belief in society through research, publications, media engagement, podcasts, animated videos, and events such as debates, seminars and lectures. Theos is headquartered in the United Kingdom in Westminster, London.
 Theos maintains an ecumenical position, committed to the traditional creeds of the Christian faith. In addition, it also works with many non-Christian and non-religious individuals and organisations.
 Theos was launched in November 2006 with the support of the then Archbishop of Canterbury, Rowan Williams, and the Catholic Archbishop of Westminster, Cardinal Cormac Murphy-O'Connor. Its first Director was Paul Woolley.
 Theos believes that religion is a significant force in public life and should have an active role in public debate. The think tank argues that Christianity has played a seminal role in the formation of British, and Western, politics and ideas. Theos believes faith is “not just important for human flourishing and the renewal of society, but that society can only truly flourish if faith is given the space to do so.”
 Opposing the idea that politicians ‘don’t do God’, as stated by Alastair Campbell in 2003, Theos’ first research report was titled ‘“Doing God”: A Future for Faith in the Public Space’ and was published on 1 November 2006. Dr Rowan Williams and Cardinal Cormac Murphy O’Connor wrote the foreword to the report, stating that Theos encourages the “reassessment...of the importance of faith to individuals and society...by increasing public understanding of faith and its contribution to public life”.
 As part of Theos' “Rescuing Darwin” project, it commissioned the play "Mr Darwin's Tree" from the Christian playwright Murray Watts, to explore "Darwin's questions about his science, himself, God and suffering" The think tank also donated £50 to the Atheist Bus Campaign in 2009, finding it a way to encourage people to consider the question of God.
 In its first years, the think tank produced reports on faith in areas of public life on sports, multiculturalism, Christmas, and politics. Its "Rescuing Darwin" project, which coincided with the 200th anniversary of Charles Darwin's birth, explored the extent and nature of evolutionary and non-evolutionary beliefs in the UK and their perceived relationship with theism and atheism. The project included an essay on Darwinism and theism in modern Britain, an extended interview with philosopher Mary Midgley, a "spiritual biography" of Charles Darwin, and two independent research studies conducted by polling company Savanta (then ComRes) and ethnographic social research agency ESRO. 
 In 2011, Elizabeth Oldfield became the Director of Theos, succeeding Paul Woolley. Under Oldfield’s leadership, Theos sought to promote informed and depolarised conversations about faith in society, with a focus on the belief that humans thrive in relationships of mutual dependence. Theos also expanded its network by collaborating with individuals from various fields, including academics, musicians, actors, and authors.[citation needed]
 The think tank launched two ongoing podcasts, ‘The Sacred’ and ‘Reading Our Times’, which serve as platforms for discussing faith and current issues.[citation needed]
 In this second phase of its history, Theos released reports on social issues, and on the topics of community, work, and social innovation. The research report "Religious London: Faith in a Global City" published in 2020 discussed the role of religion in public life. Its findings were reported in The Guardian, BBC News, The Telegraph, The Times and The Independent.
 Chine McDonald, a writer, broadcaster and public theologian, became the Director of Theos in January 2022, succeeding Elizabeth Oldfield. Prior to this role, she worked as a journalist and held communications and fundraising roles in various organisations, including Christian Aid. McDonald is also the author of the book God Is Not a White Man and regularly appears as a commentator on religion and ethics programs, including as a presenter of BBC Radio 4's “Thought for the Day.”
 Since 2022, Theos has published works including “The Nones: Who are they and what do they believe?” and “A Torn Safety Net: How the Cost of Living Crisis Threatens Its Own Last Line of Defence”, produced in partnership with the Church Urban Fund, with a joint foreword by former Archbishop of Canterbury Dr Rowan Williams and former UK Prime Minister Gordon Brown.
 Theos has been featured in mainstream media outlets, including articles for publications UnHerd, The Guardian, The Economist, the Financial Times, Prospect, Yorkshire Post, Church Times, Christianity Today, and Comment Magazine. Senior Fellow Nick Spencer hosted a BBC Radio 4 series entitled The Secret History of Science and Religion. Additionally, Theos' work has been extensively quoted in media outlets, including The Washington Post, The New Statesman, The Telegraph, The Times, The Spectator, BBC, BBC 4, BBC 5, and multiple local BBC stations.
 Nick Spencer's book, Magisteria: The Entangled Histories of Science & Religion, published in 2023, has received acclaim in New Scientist, Prospect, the Financial Times and the Times Literary Supplement.
 The think tank has also collaborated with animation director Emily Downe on several short animations on the topics of science and religion and on exploring the concept of 'worldviews', as well as for the think tank's podcast 'The Sacred'.
 British philosopher and author A.C. Grayling has been a critic of the organisation. In his book The God Argument: The Case Against Religion and for Humanism, published in 2013, Grayling devoted a chapter to criticising Theos and its research, arguing that the organisation was conservative and criticising it for what he saw as a lack of transparency in its funding and for its association with conservative Christian organisations. Overall, Grayling's criticism of Theos was part of his wider argument for the separation of religion and state and the promotion of secular humanism as an alternative worldview.
 The Sacred is a podcast produced by Theos, which is hosted by Elizabeth Oldfield, the former director of the think tank. The podcast explores the things people hold sacred in the broadest sense, including guests' deep principles or values to live by.
 The podcast has been releasing episodes since late 2017 and has featured a range of guests from various backgrounds, including academics, journalists, actors, musicians, and politicians. Some notable guests have included Justin Welby, Lord Charles Moore, Ash Sarkar, Rabbi Jonathan Sacks, Dame Prue Leith, Sally Phillips, Richard Ayoade, Nick Cave, and Rainn Wilson.
 On 11 September 2019, Theos held a live podcast recording of The Sacred at Curzon Bloomsbury in London, featuring an interview with Richard Ayoade and Lydia Fox. After a break during the COVID-19 pandemic, the podcast has resumed its annual live podcast recordings as of April 2023, with an interview featuring guest Oliver Burkeman.
 Reading Our Times is a podcast produced by Theos and hosted by Nick Spencer. The podcast aims to explore the books and ideas that are shaping contemporary society and thinking.The guests on the podcast are authors from across the anglosphere, who discuss a range of issues with the host, including meritocracy, justice, populism, human rights, the brain, liberalism, and religion.
 Guests who have appeared on the podcast in the past include Thomas Piketty, Marilynne Robinson, Lord Jonathan Sumption, Michael Sandel, Margaret Macmillan, Charles Taylor, Minouche Shafik, Martin Rees, Rowan Williams, Iain McGilchrist, Maryanne Wolf, Alan Rusbridger, and Stefan Dercon.
 
 The think tank has held annual lectures in venues around London with British public figures since its third year of existence.
 Theos, though editorially independent, is a project of the British and Foreign Bible Society, which provides some core funding. The think tank does not receive any funding from the government, corporations or religious denominations, except when conducting consultancy research for them. Theos relies on regular donations from individuals, and its published research is often funded by charitable trusts, such as the William Leech Research Fellowships, the Halley Stewart Trust, Laing Family Trusts and Sainsbury Family Charitable Trusts. The Annual Lecture of the think tank is currently sponsored by CCLA, an investment fund for charities, churches and the public sector, which is owned by its clients.