The Beachy Amish Mennonites, also known as the Beachy Amish or Beachy Mennonites, are a Conservative Anabaptist tradition of Christianity.

Commonalities held by Beachy Amish congregations include adhering to the Dordrecht Confession of Faith and practicing Anabaptist distinctives, such as nonresistance, plain dress, separation from the state, and believer's baptism. They form a loose association of churches without a central governing body. Other Beachy congregations have organized into denominations, such as the Ambassadors Amish Mennonite Churches and the Maranatha Amish-Mennonite Churches.

The Beachy Amish originated as a schism from the Old Order Amish over practices related to church discipline and revivalism, though over time, people from various backgrounds have come to join Beachy Amish congregations. Although they have retained the name "Amish", they are quite different from the Old Order Amish: they neither use horse and buggy for transportation, nor do they have restrictions on technology, except for radio and television; additionally, with a few exceptions, they no longer speak Pennsylvania Dutch. In the years 1946 to 1977, a majority of the Beachy Amish incorporated certain elements of revivalist practice, such as the preaching of the New Birth. The traditionalists who wanted to preserve the old Beachy Amish ways then withdrew and formed their own congregations. Today they are known as Midwest Beachy Amish Mennonites or Old Beachy Amish.

The Beachy church arose from a 1927 division in the (Casselman) River Old Order Amish congregation in Somerset County, Pennsylvania. Bishop Moses M. Beachy led the congregation during that time and his name became associated with the faction. The Beachys favored a milder discipline for members whose only offense was transferring membership to other Anabaptist churches, specifically the conservative Amish Mennonite congregation that broke from Moses Beachy's congregation (then not under Beachy's leadership) in 1895.^{[better source needed]}

The Beachy Amish were transformed at mid-20th century into a more evangelical group by both the incorporation of revivalist Amish who had left their original churches and joined the Beachy Amish and by a growing revivalist influence within the Beachys. One especially influential man in Lancaster County was an Amish (and later Beachy Amish) evangelist from Oklahoma, David A. Miller. Through his and other revivalist influences an Amish youth group evolved known as the "Goodies" due to their emphasis on a renewed spiritual life and avoiding the period of rumspringa as experienced in many Amish youth groups. Many of the "Goodies" eventually joined the Beachy Amish community in Lancaster County.

In contrast to the Old Order Amish, the Beachys have meetinghouses, Sunday School, and a Bible School for young adults, and most also support missionary work. Excommunication is used less frequently and accompanying bans are even rarer.

Many Beachy churches identify as being a part of the Conservative Mennonite tradition, though they have retained certain practices and a lifestyle still similar to the Old Order Amish include:

Practices that distinguish the Beachy church from the Old Order Amish include: