Tetsugaku Letra (Japanese: 鉄楽レトラ, Hepburn: Tetsugaku Retora) is a Japanese manga series written and illustrated by Mizu Sahara.

It was serialized in Shogakukan's shōnen manga magazine Monthly Shōnen Sunday from April 2011 to December 2014, with its chapters collected in six tankōbon volumes.

Written and illustrated by Mizu Sahara, Tetsugaku Letra was serialized in Shogakukan's shōnen manga magazine Monthly Shōnen Sunday from April 12, 2011,[2][3] to December 12, 2014.

[4] Shogakukan collected its chapters in six tankōbon volumes, released from October 12, 2011,[5] to February 12, 2015.

[6] The manga was licensed in Indonesia by Elex Media Komputindo,[7] in France by Kazé,[8] and in Spain by Milky Way Ediciones.