Manorexia is an experimental instrumental project of composer J.G. Thirlwell (primarily of Foetus). Manorexia was formed in 2001.

As opposed to Thirlwell's other instrumental group, Steroid Maximus, Manorexia features no collaborators and eschews musical structure for a more free‑form and spontaneous approach. The results are often described as cinematic and textural. To date all albums have been released on Thirlwell's own Ectopic Ents label. Until recently have been sold only at concerts or via the Official Foetus Website.

A trilogy of Manorexia albums has long been discussed, but no release date has been given for the final installment.

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