The Alpha course is an evangelistic course which seeks to introduce the basics of the Christian faith through a series of talks and discussions. It is described by its organisers as "an opportunity to explore the meaning of life". Alpha courses are run in churches, homes, workplaces, prisons, universities and a wide variety of other locations. The course began in Britain and is run around the world by various Christian denominations.

Holy Trinity Brompton with St Paul's, Onslow Square and St Augustine's, South Kensington, often referred to simply as HTB, is an Anglican church in London, England.