Welkinweir is an historic 162-acre estate, arboretum, and nature sanctuary in East Nantmeal Township, Chester County, Pennsylvania. The property, which in the early 18th century was part of Reading Furnace, was purchased in 1935 by Everett G. (1902-1983) and Grace H. (1905-1999) Rodebaugh, philanthropists, conservationists, and socialites. Everett owned a prominent court reporting business. Welkinweir is owned and administered by Green Valleys Watershed Association, an environmental organization the Rodebaughs helped found in 1964. It was placed on the National Register of Historic Places in 2001.

Welkinweir is the repository of the Everett and Grace Rodebaugh papers, circa 1890-1985, which consist of approximately 25 linear feet of materials containing Everett Rodebaugh's professional papers, which include correspondence and legal/court records and transcripts; the personal papers of Everett and Grace, which largely include photographs, travel slides, and letters between the two; and materials relating to the Welkinweir estate such as photographs, correspondence, financial and legal documents, and blueprints. Welkinweir also holds the Estelle Cremers collection on Welkinweir, circa 1975-2001 (bulk 1990-2001), a small accumulation of materials compiled by Estelle Cremers in her role as executrix for the estate of Grace Rodebaugh and historian of Welkinweir.