An optical absorption study has been made of trapped electrons produced in -irradiated organic-mixture glasses at 77 K. Electronic spectra were observed for trapped electrons in a variety of binary-mixture glasses which consist of solvents with various polarity. Optical parameters obtained from the observed spectra are reported. The spectra of trapped electrons have the only one absorption maximum in all of the mixture glasses studied except for 2-propanol-3-methylpentane glass. The absorption maximum in the spectrum of trapped electrons in a mixed solvent is located at a wavelength between those in pure component solvents, the wavelength depending on the mixture composition. There are two absorption maxima in the spectrum of trapped electrons in 2-propanol-3-methylpentane glass, each maximum corresponding to that in its component spectrum. Changes in the trappedelectron spectra with composition of the mixtures are interpreted in terms of the polarity and structure effects.