Celebrate Bisexuality Day (also called Bisexual Pride Day, or Bi Visibility Day, is observed annually on September 23rd to recognise and celebrate bisexual people, the bisexual community, and the history of bisexuality.

Bisexuality is a sexual orientation that means a person has the capacity for emotional, romantic, or sexual attraction to more than one gender. The attraction does not have to be split equally, and a person does not need any specific relationship experience to identify this way.