Islam is the main religion of the citizens of Kuwait and the majority of Kuwaiti citizens are Muslim; it is estimated that 60%–65% are Sunni and 35%–40% are Shias.^[1][2][3] In 2001, there were an estimated 525,000 Sunni Kuwaiti citizens and 300,000 Shia Kuwaiti citizens.^[4] In 2002, the US Department of State reported that Shias formed 30%-40% of Kuwait's citizen population,^[5] noting there were 525,000 Sunni Kuwaiti citizens and 855,000 Kuwaiti citizens in total (61% Sunnis, 39% Shias).^[5] In 2004, there were an estimated 600,000 Sunni Kuwaiti citizens, 300,000-350,000 Shia Kuwaiti citizens and 913,000 Kuwaiti citizens in total.^[6]

Some other minor Muslim sects do exist in Kuwait's society, but in very small or rare numbers. There are no estimates of the number of non-citizen Muslims.

• Religion in Kuwait
• Demographics of Kuwait