Asia does not have an actual flag, but there are multiple leagues who have them, such as the Asian Union and the Arab League.
The Arab League has a flag with the above an upward-facing crescent.. This itself is contained in a wreath, which is colored white. This is all on a green background.
ASEAN's flag sports a blue background. There is a red spot in the middle that has a white border. Inside the red spot are ten yellow rice stalks arranged in an hourglass shape. Each stalk represents an ASEAN member.