How many Mormons are there in the world?

Answer 1

The Church of Jesus Christ of Latter-day Saints (commonly known as the LDS Church, or the Mormon Church) reported 13,824,854worldwide members on record in October 2010.

There are other groups which have broken away from the LDS Church, but still call themselves Mormon. For example, the Community of Christ (formerly the Reorganized Church of Jesus Christ of Latter-day Saints) has about 250,000 members. The polygamist Fundamentalist Church of Jesus Christ of Latter-day Saints is estimated to have between 6,000 and 10,000 members.

There is some debate, however, as to how accurately membership records reflect the number of people who actually consider themselves to be Mormons. For example, the rate of activity (people who actually go to church regularly) in the LDS Church has been estimated at around 35% worldwide, which would put the number of active Latter-day Saints at under 5 million.

See related links for a list of stats and facts about the LDS Church.
Official 2009 Year-end Records of the Church of Jesus Christ of Latter-day Saints (commonly called the "Mormon" Church) state that there are 13,750,651 baptized members of the Church worldwide.

Answer 2

As of 2021, there are approximately 16.6 million members of The Church of Jesus Christ of Latter-day Saints worldwide.