Horace Jacobs (April 5, 1816 – May 3, 1884) was a notable eclectic physician in Springfield, Massachusetts, a pioneer in his field. He was born one of nine children of Simeon Jacobs and Mary Kenney in Royalston, Massachusetts. His paternal great grandfather was Rev. Whitman Jacobs, an influential Baptist preacher, while his maternal grandfather was also a noted Baptist preacher.