Walter Odington was a 14th-century English Benedictine scientific and especially musical theory author. He is also known as Walter of Evesham, by some writers confounded with Walter of Eynsham, who lived about fifty years earlier, died not earlier than 1330.
He wrote chiefly on scientific subjects. His work De Speculatione Musices was first published in complete form in Edmond de Coussemaker's Scriptores; other works are in manuscript only. In this treatise, a remarkable work written at Evesham and therefore certainly before 1316, according to Riemann before 1300, the author gathered together practically all the knowledge of the theory of music possessed at his time and added some theoretical considerations of his own (including reintroducing the just major third). A discussion of his work is given by Riemann,[full citation needed] who claims for him the distinction of having, before the close of the thirteenth century, established on theoretical grounds the consonance of minor and major thirds.
Davey[full citation needed] enumerates the following works:
- "De Speculatione Musices"; "Ycocedron", a treatise on alchemy
- "Declaratio motus octavæ spheræ"
- "Tractatus de multiplicatione specierum in visu secundum omnem modum"
- "Ars metrica Walteri de Evesham"
- "Liber quintus geometriæ per numeros loco quantitatum"
- "Calendar for Evesham Abbey".