Isaac Dashiell Jones (November 1, 1806 - July 5, 1893) was a U.S. Congressman from Maryland, serving from 1841 to 1843. Born on the family homestead Wetcpquin in Somerset County, Maryland, Jones completed preparatory studies and graduated from Washington Academy, where he became assistant tutor before his studies were completed. He studied law, was admitted to the bar, and commenced practice in Princess Anne, Maryland. He served as a member of the Maryland House of Delegates in 1832, 1835, 1840, and 1866.
Jones was elected as a Whig from Maryland's 1st Congressional district to the Twenty-seventh Congress, serving from March 4, 1841 to March 3, 1843. He took an active part in the Maryland constitutional conventions of 1864 and 1867, and was elected Attorney General of Maryland in 1867. He was later elected judge of the court of arbitration of Baltimore, Maryland in 1877, and served as director of the Maryland State School for the Deaf in Frederick, Maryland from 1867-1893, and of the Maryland School for the Colored Blind and Deaf at Baltimore from 1872 to 1893. He died in Baltimore in 1893, and is interred in Greenmount Cemetery.
