Johann Michael Mattheis
- Born: 28 Sep 1779, Hempfield Township, Westmoreland County, PA
- Marriage (1): Catherine Kopp (Cope) in 1810 in Westmoreland County, Pennsylvania
- Died: 20 Oct 1865, Hempfield Township, Westmoreland County, PA at age 86
- Buried: Seanor's Cemetery, Hempfied Twp., Westmoreland Co PA
 General Notes:
Johan Michael was a native of Westmoreland County and was one of the pioneer settlers of Hempfield Township. He cleared and cultivated a farm and raised his family.
Johann married Catherine Kopp (Cope), daughter of George Kopp (Cope) and Susanna Cope, in 1810 in Westmoreland County, Pennsylvania. (Catherine Kopp (Cope) was born on 27 Jun 1793 in Hempfield Township, Westmoreland County, PA and died on 30 Jan 1853 in Hempfield Township, Westmoreland County, PA.)
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