The Celeb Girl Kiss Index, also known as the Celebrity Kiss Index or simply Kiss Index, is an informal, tongue-in-cheek ranking system used to rate female celebrities based on the number of on-screen kisses they have shared with their co-stars in movies or TV shows.

The index is subjective and often used by fans, media, and celebrity watchers to gauge a celebrity's on-screen romantic and intimate involvement. It's usually measured by counting the number of kisses shared with co-stars, particularly romantic leads or love interests.

The concept of the Celeb Girl Kiss Index likely originated from the celebrity-obsessed culture and the endless scrutiny of Hollywood stars' on-screen and off-screen relationships. With the rise of social media, fan sites, and entertainment blogs, tracking and discussing celebrities' on-screen kisses has become a popular pastime.