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Roger of Hereford (sometimes Roger Infans or Roger Puer; flourished 1176–1198) was a medieval astronomer active at Hereford in the period 1178 to 1198.

Nothing is known of Roger's nationality or when he was born nor of his education. He first appears in the historical record in 1176, when he wrote a computus, a treatise on calculating ecclesiastical dates for Gilbert Foliot, who had previously been Bishop of Hereford but was at that time Bishop of London. In this computus, Roger criticized the work of Gerland, which was the standard work at the time on calculating ecclesiastical dates, and drew on Hebrew and Arabic learning.