Severini Boesyo (jina kamili kwa Kilatini: Anicius Manlius Severinus Boëthius Roma, 480 – Pavia, 524 BK), alikuwa seneta wa Bunge la Roma, gavana, magister officiorum, na mwanafalsafa wa mwanzo wa karne ya 6. Aliishi na kufanya kazi chini ya utawala wa Waostrogoti walioteka Italia na kumaliza Dola la Roma miaka 4 kabla hajazaliwa. Hatimaye mfalme Theoderiko Mkuu aliagiza auawe mwaka 524 kwa tuhuma ya kufanya njama ya kumuua. Akiwa gerezani, Boesyo aliandika kitabu chake bora, De Consolatione Philosophiae ("Faraja ya Falsafa"), ambacho ni kati ya vile vilivyoathiri zaidi Karne za Kati. Tangu mwaka 1883 Kanisa Katoliki linamheshimu Boesyo kama mtakatifu mfiadini. Sikukuu yake huadhimishwa tarehe 23 Oktoba. Hisabati De arithmetica (On Arithmetic, c. 500) adapted translation of the Introductionis Arithmeticae by Nicomachus of Gerasa (c. 160 – c. 220). De musica (On Music, c. 510), based on a lost work by Nicomachus of Gerasa and on Ptolemy’s Harmonica. Possibly a treatise on geometry, extant only in fragments.