Andrew Ellicott (1733 – 1809) was one of three Quaker brothers from Bucks County, Province of Pennsylvania who chose the wilderness up river from Elk Ridge Landing (known today as Elkridge, Maryland) to establish a flour mill.^[2] John, Andrew, and Joseph Ellicott founded Ellicott's Mills which became one of the largest milling and manufacturing towns in the East.^[3]

The Ellicott brothers helped revolutionize farming in the area by persuading farmers to plant wheat instead of tobacco and also by introducing fertilizer to revitalize depleted soil.^[4] Charles Carroll, a signer of the Declaration of Independence, was an early influential convert from tobacco to wheat.^[5] Andrew worked principally as a financier leaving his interests to his sons.^[6] His sons Jonathan and George Ellicott built their home by the river in Oella, Maryland.^[7]

Andrew Ellicott was the uncle of the famous surveyors Andrew Ellicott and Joseph Ellicott.