A composition for a near infrared light-absorbing film includes a solid-phase first copper phosphate ester compound, and a liquid-phase second copper phosphate ester compound, wherein at least one part of the first copper phosphate ester compound is dissolved in the second copper phosphate ester compound, and the second copper phosphate ester compound is non-volatile in a temperature region of about 20° C. to about 300° C. The composition may be included in an optical filter, a camera module, and an electronic device.