William Jefferson Winter

William Jefferson Winter (1878–1929) was an American writer and researcher connected with a notable theatrical family. Library and archival records identify him as the son of critic and author William Winter, and show that his correspondence and research materials later became part of collections documenting his father's life and career.

The published record suggests that his work centered on theater history and remembrance. He was credited as the author of In Memory of Frank Worthing, Actor (1911), and later records for The Life of David Belasco note that the book was completed after his father's death by William Jefferson Winter.

Although biographical details about his personal life are scarce in easily available sources, the trace he left behind is clear: he helped preserve stories, papers, and personalities from the American stage at a time when much of that world was passing out of living memory.