Evangelism refers to the practice of relaying information about a particular set of beliefs to others who do not hold those beliefs. The term is often used in reference to Christianity.

Christians who specialise in evangelism are known as evangelists whether they are in their home communities or acting as missionaries in the field. Some Christian traditions consider evangelists to be in a leadership position; they may be found preaching to large meetings or in governance roles. Christian groups who actively encourage evangelism are sometimes known as evangelistic or evangelist. The scriptures do not use the word evangelism, but evangelist is used in Acts 21:8, Ephesians 4:11, and 2 Timothy 4:5.

The communication of Christian faith to new geographical areas and cultures is often referred to as evangelization, or specifically, world evangelization.