Heavy Object (ヘヴィーオブジェクト, Hevī Obujekuto) is a Japanese light novel series, written by Kazuma Kamachi and illustrated by Ryō Nagi.

In the future, the development of massive war machines with spherical main bodies called Objects, due to their firepower and, most important of all, their integrity, have rendered all manner of conventional warfare, and even tactical nuclear weapons seemingly obsolete.

As a result of this military upheaval, all of the nations of the world have fractured into four coalitions which constantly wage war on each other; the "Legitimacy Kingdom", focused on tradition; the "Capitalist Corporation" (in the anime the "Capitalist Enterprise"), which values profit; the "Information Alliance" (in the anime the "Intelligence Union"), focused on knowledge; and the "Faith Organization", which values religion above everything else.

[27] A second manga adaptation, with art by Sakae Saitō, titled Heavy Object S, was also serialized in Dengeki Maoh from December 27, 2011, to June 27, 2013.

[31][32] An anime television series adaptation was announced at the Dengeki Bunko Fall Festival event on October 5, 2014.

[33][34] The series aired on Tokyo MX, MBS, TV Aichi, BS11, and AT-X from October 2, 2015, to March 25, 2016, and was 24 episodes long.