This volume comprises two invited talks and fifteen selected papers, chosen from over 200 submissions to the 15th International Conference on the History of Language Sciences (ICHoLS XV). Originally scheduled to be held in Milan in 2020, the conference was postponed and moved online due to the COVID-19 pandemic. Held from August 23-27, 2021, it connected scholars from 30 countries across various time zones. The volume is divided into three parts. The first part, devoted to General and Particular Issues in the History of Linguistics, recalls classical authors in relation to contemporary ones as well as newly established disciplines and subtle epistemological inquiries. The second part, Antiquity, mainly investigates the Sanskrit language and various descriptive and didactic studies, approached from both ancient and contemporary metalinguistic frameworks. The third part deals with Sixteenth to Twentieth Century Works, ranging from the Tamil language to American archives, and from experimental phonostylistics to the history of monosemy.