Welch Factory Building No. 1 is a historic grape juice factory located at Westfield in Chautauqua County, New York. It was built in 1897 and expanded in 1899 and 1903, to be an 8-bay wide, 10-bay deep rectangular building. It is the oldest extant structure associated with the Welch's company.It was listed on the National Register of Historic Places in 1983.