The Evangelical Alliance is made up of hundreds of organisations, thousands of churches and tens of thousands of individuals, joined together for the sake of the gospel. Representing their members since 1846, the Evangelical Alliance is the oldest and largest evangelical unity movement in the UK. The Evangelical Alliance is also the founding member of the World Evangelical Alliance, which unites evangelical alliances based around the world, representing up to an estimated one billion evangelical Christians worldwide. This reflects the global reach and influence of evangelical faith, which can also be seen in the huge social and ethnic diversity in evangelical churches within the UK.

Throughout its history, the Evangelical Alliance has been at the forefront of campaigns for Christian unity, religious liberty and social transformation.