The rainbow flag is a symbol of lesbian, gay, bisexual, transgender (LGBT) and queer pride and LGBT social movements. Also known as the gay pride flag or LGBT pride flag, the colors reflect the diversity of the LGBT community and the spectrum of human sexuality and gender. Using a rainbow flag as a symbol of gay pride began in San Francisco, but eventually became common at LGBT rights events worldwide.

Originally devised by artist Gilbert Baker, the design has undergone several revisions since its debut in 1978, first to remove colors then restore them based on availability of fabrics. Baker's first rainbow flag had eight colors, though the most common variant consists of six stripes: red, orange, yellow, green, blue, and violet. The flag is typically flown horizontally, with the red stripe on top, as it would be in a natural rainbow.

LGBT individuals and allies currently use rainbow flags and many rainbow-themed items and color schemes as an outward symbol of their identity or support. In addition to the rainbow, many other flags and symbols are used to communicate specific identities within the LGBT community.