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William was born in 1287 in the village of Ockham (probably the village of that name near London in Surrey). He probably entered the Franciscans at London as ''puer oblatus'', when he was seven or eight, where he would have received instruction in grammar and elementary logic, as well as an introduction to Franciscan life. After his novitiate, he embarked on more advanced studies of logic and philosophy in London, and he was ordained subdeacon at the age of eighteen in 1306. He continued to study philosophy and theology until he was admitted to the lectorate program at the Oxford ''studium'' in 1310.  

William was born in 1287 in the village of Ockham (probably the village of that name near London in Surrey). He probably entered the Franciscans at London as ''puer oblatus'', when he was seven or eight, where he would have received instruction in grammar and elementary logic, as well as an introduction to Franciscan life. After his novitiate, he embarked on more advanced studies of logic and philosophy in London, and he was ordained subdeacon at the age of eighteen in 1306. He continued to study philosophy and theology until he was admitted to the lectorate program at the Oxford ''studium'' in 1310.  

After possible position as lector on the Sentences ''pro exercitio'' (the result of which may have been the first version of his commentary on the Sentences , the ''reportatio''), he was enlisted into the Oxford degree program (c. 1317/1319). On 18 June 1318 he was ordained priest in Oxford and received a licence to hear confessions. In 1319, he embarked on his biblical lectures (from that period stems his introductory lecture on the Bible, ''De Connexione Virtutum'', and his ''De Compossibilitate Actus Virtuosi'' et ''Intellectus Erronei'').  

He began studying theology in Oxford, probably in 1317, when he began the requisite two-year period of lecturing on Peter Lombard's ''Sentences''. On 18 June 1318 he was ordained priest in Oxford and received a licence to hear confessions.  

After undertaking the compulsory two-year residency at Oxford, and awaiting his inception in theology at Oxford, he is thought to have taught philosophy at the Franciscan ''Studium Generale'' in London, and to have worked alongside Walter Chatton and Adam de Wodeham (his foremost disciple)<ref>The view that Ockham was resident in London between 1321

After this, probably in 1321, he is thought to have taught philosophy at the Franciscan ''Studium Generale'' in London, and to have worked alongside Walter Chatton and Adam de Wodeham (his foremost disciple)<ref>The view that Ockham was resident in London between 1321 and 1324 was first proposed by Father Gedeon Gal in the introduction to the critical edition of Ockham's Summa logicae in 1974 (Introduction to ''Ockham, Summa logicae'' (Opera Philosophica 1), ed. Ph. Boehner,G. Gal, and S. Brown. St. Bonaventure 1974, but was challenged by Courtenay, 1990.  Courtenay regards the 'London period' as probable, but far from certain.</ref>. From this 'London period' date most of Ockham’s important philosophical works, his eucharistic treatises (''De quantitate'' and ''De Corpore Christi''), and his great work, the ''Summa Logicae''.  

and 1324 was first proposed by Father Gedeon Gal in the introduction to the critical edition of Ockham's Summa logicae in 1974 (Introduction to ''Ockham, Summa logicae'' (Opera Philosophica 1), ed. Ph. Boehner,G. Gal, and S. Brown. St. Bonaventure 1974, but was challenged by Courtenay, 1990.  Courtenay regards the 'London period' as probable, but far from certain.</ref>. From this 'London period' date most of Ockham’s important philosophical works, his eucharistic treatises (''De quantitate'' and ''De Corpore Christi''), and his great work, the ''Summa Logicae''.  

In this period, Ockham also began his ''Quodlibeta'', completed in Avignon c.1325, and revised his ''Sentences'' commentary (resulting in the ''Ordinatio'', the version of the commentary that Ockham defended before the examination committee in Avignon). Ockham encountered opposition to the work he completed in England, even from fellow friars such as Walter Chatton, whose students accused Ockham of heresy. This Franciscan opposition probably also led to Ockham’s appearance before the provincial chapter of 1323.  

In this period, Ockham also began his ''Quodlibeta'', completed in Avignon c.1325, and revised his ''Sentences'' commentary (resulting in the ''Ordinatio'', the version of the commentary that Ockham defended before the examination committee in Avignon). Ockham encountered opposition to the work he completed in England, even from fellow friars such as Walter Chatton, whose students accused Ockham of heresy. This Franciscan opposition probably also led to Ockham’s appearance before the provincial chapter of 1323.