William Calthorpe, English knight (died 1494)

Sir William Calthorpe was an English knight and Lord of the Manors of Burnham Thorpe and Ludham in Norfolk. He is on record as High Sheriff of Norfolk and Suffolk in 1442, 1458 and 1464 and 1476.

January 30 is the 30th day of the year in the Gregorian calendar; 335 days remain until the end of the year.