Rainbow 1 is an Agogo Bar located in Bangkok's Nana Plaza (Nana Plaza), and is also Bangkok's largest post-op ladyboy venue. The bar is situated on the 1st floor of Nana Plaza—head straight from the entrance to the end, and it's on the right-hand side, adjacent to Rainbow 1. Unlike other post-op Agogo Bars in Bangkok, this spot offers a more relaxed, low-pressure vibe, with scheduled song and dance shows plus live interactive sessions every night.

Rainbow 1 officially changed ownership in February 2025 and reopened in March, becoming the only Agogo Bar in Nana Plaza featuring post-op ladyboy performances. In addition to post-op ladyboy dancers, the performers include male dancers, all with extensive stage experience. The costumes and choreography are meticulously designed, making it a great spot for both male and female guests to enjoy the show and soak up the atmosphere.

Beyond the performers, most of the girls here are attractive post-op ladyboys. Buy a girl a drink, and you can casually watch the show while chatting with her. While there's less pressure to bar fine compared to Nana Plaza spots like Wonderland and Star, one particular mamasan has some slick tactics for scoring drinks and tips. If you're okay with that, it's worth checking out.