A megachurch is a church with an unusually large membership that also offers a variety of educational and social activities, usually Protestant or Evangelical. The Hartford Institute for Religion Research defines a megachurch as any Protestant Christian church having 2,000 or more people in average weekend attendance.
The concept originated in the mid 19th century, continued onward into the mid 20th century and expanded rapidly through the 1980s and 1990s; in present days it is widely seen across America in the early 21st century.
The origins of the megachurch movement, with many local congregants who return on a weekly basis, can be traced to the 1800s. There were large churches earlier, but they were considerably rarer. The first evangelical megachurch, the Metropolitan Tabernacle with a 6000-seat auditorium, was inaugurated in 1861 in London by Charles Spurgeon. In the United States, in 1923, the Angelus Temple was inaugurated in 1923 with a 5,300-seat auditorium in Los Angeles by Aimee Semple McPherson. A study by the Hartford Institute for Religion Research published in 2020 found that 70 percent of American megachurches had a multi-site network and an average of 7.6 services per weekend. The study also found that the majority of US megachurches are located in Florida, Texas, California and Georgia.
In 2010, the Hartford Institute's database listed more than 1,300 such megachurches in the United States; according to that data, approximately 50 churches on the list had average attendance exceeding 10,000, with the highest recorded at 47,000 in average attendance. On one weekend in November 2015, around one in ten Protestant churchgoers in the US, or about 5 million people, attended service in a megachurch. 3,000 individual Catholic parishes have 2,000 or more attendants for an average Sunday Mass, but they are not called megachurches as that is a specifically Protestant term.
Globally, these large congregations are a significant development in Protestant Christianity. In the United States, the phenomenon has more than quadrupled in the past two decades. It has since spread worldwide. In 2007, five of the ten largest Protestant churches were in South Korea. The largest megachurch in the world by attendance is South Korea's Yoido Full Gospel Church, an Assemblies of God church, with more than 830,000 members as of 2007. The largest church auditorium, Glory Dome, was inaugurated in 2018 with 100,000 seats, in Abuja, Nigeria.
In 2005, Baptist Pastor Al Sharpton criticized megachurches for focusing on "bedroom morals", statements against same-sex marriage and abortion, by ignoring issues of social justice, such as the immorality of war and the erosion of affirmative action.
In 2018, American professor Scot McKnight of Northern Baptist Theological Seminary criticized nondenominational megachurches for the weak external accountability relationship of their leaders, by not being members of a Christian denomination, further exposing them to abuse of power. However, a study by the Hartford Institute for Religion Research published in 2020 found that 60% of American megachurches were members of a Christian denomination.
Some megachurches and their pastors have been accused by critics of promoting a "prosperity gospel", where the poor and vulnerable are encouraged to donate their money to the church rather than saving it, in the hopes that God will bless them with wealth. This in turn increases the wealth of the pastors, with some revealed to wear designer clothing during sermons and own luxury vehicles.