Thermae Romae Novae (テルマエ・ロマエ ノヴァエ) is an original net animation series adaptation by NAZ of the Japanese manga series Thermae Romae. It was announced during Netflix Anime Festival 2020 and premiered on Netflix on March 28, 2022. The series is directed by Tetsuya Tatamitani and written by Yūichirō Momose.

Each episode also has a live action section where author Mari Yamazaki explores different hot springs in Japan at the end of the episode. The opening theme is "Toreador Song ~An Aria for Bath House Manners~" (闘牛士の歌 ～温泉マナーのアリア～, Tōgyūshi no Uta ~Onsen Manner no Aria~) by Paolo Andrea Di Pietro.

Lucius Modestus, a proud bathhouse architect in ancient Rome, struggles in his profession after running out of new ideas. Seeking relief, he visits a public bath, where an unexpected incident causes him to be transported through a hidden passage to modern-day Japan. There, Lucius encounters contemporary Japanese bathhouses and is astonished by their advanced designs, technologies, and cultural practices surrounding bathing.

Each time Lucius returns to Rome, he attempts to recreate the innovations he has observed in Japan using the limited materials and knowledge available in his era. Although his reproductions are often imperfect, their originality and ingenuity earn widespread admiration, allowing him to renew his reputation and secure many new commissions.