A short-term mission (STM) is the mobilization of a Christian missionary for a short period of time ranging from days to a year; many short-term missions are called mission trips. The short-term missionary is a fairly recent innovation in the global missions movement, but many short-term missions agencies are seeing an increased number of trips that consist of a week up to a year.

Generally, missionaries have been men and women who dedicated large portions of their lives to serving overseas in Christian service. In the past 50 years, churches have moved toward mobilizing young people for short-term trips.

Youth with a Mission (YWAM) and Operation Mobilisation (OM) were two of the first organizations to utilize short term missions. In the late 1950s, OM Founder George Verwer began mobilizing young people for summer missions. In the summer 1963, over 2,000 people joined the first short-term mission teams with Operation Mobilization. They worked throughout Europe and found creative ways of getting behind the Iron Curtain. Youth With a Misison (YWAM) began in the 1960s under the leadership of Loren Cunningham. He pioneered short term missions and introduced the idea that young people could be missionaries. Generally, missionaries were expected to have extensive theological training before going into the foreign mission field, but YWAM provided short-term opportunities for young people who had a passion for Jesus Christ to share their faith in a way that was powerful and effective. Eventually, YWAM began offering courses to train missionaries as a substitution or supplement to formal theological training. With OM, the summer conferences continued each year but the participants dwindled. In late 1987, a renewed vision for reaching Europe was born. This led to the “Love Europe” outreaches that started in July 1989. OM planned for 5,000 young people from 50 nations to participate; in fact, about 7,000 from 76 nations came.