Colonel Thomas Cresap (c.1702—c.1790) was an English-born settler and trader in the states of Maryland and Pennsylvania. Cresap served Lord Baltimore as an agent in the Maryland–Pennsylvania boundary dispute that became known as Cresap's War. Later, together with the Native American chief Nemacolin, Cresap improved a Native American path to the Ohio Valley, and ultimately settled and became a large landowner near Cumberland, Maryland, where he was involved in further disputes near Brownsville, Pennsylvania, including in the French and Indian War and Lord Dunmore's War.