A Common Word between Us and You is an open letter, dated 13 October 2007, from leaders of the Islamic religion to leaders of the Christian religion. It calls for peace between Muslims and Christians and tries to work for common ground and understanding between both religions, in line with the Qur'anic commandment to "Say: 'O People of the Scripture! come to a common word as between us and you: that we worship none but God'" and the Biblical commandment to love God, and one's neighbour. In the time since its release, "A Common Word" opened an interfaith dialogue between Christians and Muslims. In 2008 the initiative was awarded the "Eugen Biser Award", and the "Building Bridges Award" from the UK's Association of Muslim Social Scientists.
"A Common Word between Us and You" is a follow up to a shorter letter, sent in 2006, in response to Pope Benedict XVI's lecture at the University of Regensburg on 12 September 2006. This lecture, on the subject of faith and reason, had focused mainly on Christianity and what Pope Benedict called the tendency in the modern world to "exclude the question of God" from reason. Islam features in a part of the lecture. The Pope quoted a Byzantine Emperor's strong criticism of Muhammad's teachings. Pope Benedict clarified that this was not his own personal opinion, describing the quotation as being of a "startling brusqueness, a brusqueness which leaves us astounded."
Throughout the world, however, many people thought the Pope's use of the quote insensitive. A very strong sense of injustice was expressed by many Muslims in response to the speech. One month later, 38 Islamic scholars, representing all branches of Islam, replied to Pope Benedict in "An Open Letter to the Pope," dated 13 October 2006. One year later, 138 Islamic personalities co-signed an open letter entitled "A Common Word between Us and You." The letter aimed to promote interfaith dialogue.