The Matthias Gast House is a historic building in Maria Stein, Ohio, United States.

Built in the middle of the nineteenth century, it was the home of one of Mercer County's most prominent early citizens, and it has been designated a historic site because of its importance in local history.

A native of France, Matthias Gast was born in 1813 and immigrated to the United States in 1828.

In later years, younger members of the Gast family built a substantial addition to the rear of the house to accommodate increasing numbers of relatives.

[4] In 1978, the Gast property — parts of which had been sold to other families[2] — was listed on the National Register of Historic Places.