This dataset documents the professional and creative networks of Marion Scott (1877-1953), a violinist, music critic, musicologist, and co-founder of the Society of Women Musicians. Compiled from 76 archival documents and records held at the Royal College of Music, it provides a structured account of relationships and biographical details relevant to early 20th-century British musical culture. The collection comprises two interrelated datasets, each provided in both Excel (.xlsx) and CSV (.csv) formats: Marion_Scott_networks_dataset — a relationship dataset detailing 774 documented connetctions between 475 individuals, with fields including Source_ID, Source_Name, Target_ID, Target_Name, Relationship_Type, Date, Document_Type, Document_Reference, Location, Event_Context, Interaction_Direction, and Weight (1–5 scale). Marion_Scott_networks_unique_names — a biographical dataset containing the same 475 unique individuals, with details such as Person_ID, Full_Name, Gender, Nationality, Occupation/Role, Years_Active, and First_Appearance_Date. All data was manually extracted and systematically verified against original sources. The structured format supports applications in social network analysis, enabling researchers to examine women’s cultural leadership and reassess established narratives of musical history in Britain between 1906 and 1953.