Lagrange: The Flower of Rin-ne (輪廻のラグランジェ Flower declaration of your heart, Rinne no Raguranje) is a Japanese anime television series produced by Xebec and Production I.G and directed by Tatsuo Sato and Toshimasa Suzuki, written by Shotaro Suga, original character design by Haruyuki Morisawa and music by Saeko Suzuki & TOMISIRO.

The first season aired in Japan between January 8, 2012 and March 24, 2012 while the second season started airing between July 8, 2012 and September 23, 2012 following a recap episode on July 1, 2012. Both seasons have been licensed by Viz Media in North America and Anime on Demand in the United Kingdom. A manga accompaniment began serialization in Square-Enix's Young Gangan magazine from September 2011. A hybrid Blu-ray Disc containing an original video animation and a PlayStation 3 video game was released on August 23, 2012.