1. 2024
2. Nant a Llwybrau

   Dobson, B. (Author), Wiliams, G. (Supervisor) & Jones, A. (Supervisor), 16 May 2024

   Student thesis: Doctor of Philosophy

3. 2023

4. The Uses of Patagonia. Representations of Y Wladfa in post-Devolution Wales

   Borda Green, S. (Author), Miranda-Barreiro, D. (Supervisor) & Wiliams, G. (Supervisor), 20 Sept 2023

   Student thesis: Doctor of Philosophy

5. 2019
6. Rhwng Gwrthryfel a Gwacter:Agweddau ar y theatr Gymraeg, 1945-79

   Hughes, L. (Author), Wiliams, G. (Supervisor), 11 Nov 2019

   Student thesis: Doctor of Philosophy

7. 2018
8. Twf a datblygiad ffuglen o fewn gwasg gyfnodol Gymraeg y ddeunawfed ganrif

   Roberts, G. (Author), Wiliams, G. (Supervisor), 22 Oct 2018

   Student thesis: Doctor of Philosophy

9. Yr un hen stori a’r ffilm yn fy mhen: portffolio a dadansoddiad o broses greadigol

   Northey, S. (Author), Wiliams, G. (Supervisor) & Price, A. (Supervisor), 2018

   Student thesis: Doctor of Philosophy

10. 2016
11. Veritas: : hanes a'r nofel ddirgelwch

    Davies, M. (Author), Wiliams, G. (Supervisor), Jan 2016

    Student thesis: Doctor of Philosophy

12. 2015
13. Tri dramodydd cyfoes: Meic Povey, Siôn Eirian ac Aled jones Williams

    Williams, M. (Author), Wiliams, G. (Supervisor), Jan 2015

    Student thesis: Doctor of Philosophy

14. 2013
15. Patrymau defnydd iaith disgyblion cyfnod allweddol 2 a chyfnod allweddol 3

    Hughes, B. (Author), Wiliams, G. (Supervisor), 30 Jun 2013

    Student thesis: Doctor of Philosophy