Provided are light absorption spectrum correction devices, methods of manufacturing the light absorption spectrum correction devices, and methods of correcting a light absorption spectrum. The light absorption spectrum correction device includes: a light source configured to emit light； an attenuated total reflectance (ATR) crystal layer configured to contact a subject and provide an optical passage along which the light emitted from the light source travels to the subject； a pressure sensor configured to detect a contact pressure applied to the ATR crystal layer by the subject； a spectrum detector and analyzer configured to detect light emitted from the ATR crystal layer, form a light absorption spectrum based on the detected light, and determine an intensity of the light emitted from the ATR crystal layer； and a spectrum correction device configured to correct the light absorption spectrum based on the contact pressure.
