Theophilus Metcalfe (bap. 1610 – c.1645) was an English stenographer. He invented a shorthand system that became popular, in particular, in New England, where it was used to record the Salem witch trials.
A professional writer and teacher of shorthand, Metcalfe in 1645 resided in the London parish of St Katharine's by the Tower. He died that year or early in 1646, when his widow assigned rights to reissue the book of his system.
Metcalfe published a stenographic system very much along the lines of Thomas Shelton's Tachygraphy. The first edition of his work was entitled Radio-Stenography, or Short Writing and is supposed to have been published in 1635. A so-called sixth edition appeared at London in 1645. It was followed in 1649 by A Schoolmaster to Radio-Stenography, explaining all the Rules of the said Art, by way of Dialogue betwixt Master and Scholler, fitted to the weakest capacities that are desirous to learne this Art. Many editions of the system appeared under the title of Short Writing: the most easie, exact, lineall, and speedy Method that hath ever yet been obtained or taught by any in this Kingdome.
The numbering of later editions, from the 19th of 1679 reflects no more than different printings taken from the same plates, engraved by Frederick Henry Van Hove of Haarlem. A final edition, called 55th, appeared in 1721.