Nice Girl Project! (NICE GIRL プロジェクト！), often shortened to NGP, was a Japanese idol musical collective formed by Tanabe Agency, Space Craft Group, Up-Front Group, and TNX. The project was created by Tsunku and launched on October 15, 2007. Nice Girl Project! began its full-time activities in April 2008.

Before its disbandment, the project's roster consisted of groups The Possible, Canary Club; soloists Tokky and Mana Ogawa; and the trainee group, Nice Girl Project! Kenshusei. The project also consisted of groups Nice Girl Mu (ナイスガールμ), GTT Club (GTT倶楽部), and MM Gakuen Gasshoubu (ＭＭ学園合唱部); and soloists Kafumio (何文櫻), Peach (Momoko Otsuka), and Karen Kato prior to their disbandment or departure.

Nice Girl Project! was dropped as an act in 2015 and all information and social media was removed from TNX's official website. In the same year, one of their flagship groups, The Possible, was renamed "Ciao Bella Cinquetti" and transferred to Up-Front Works.