John Benjamin Thomas (December 23, 1819 – October 22, 1893) was an American politician and judge from Maryland.

He served as a member of the Maryland House of Delegates, representing Frederick County from 1858 to 1860 and 1870 to 1872.

[2] He served as a member of the Maryland House of Delegates, representing Frederick County from 1858 to 1860 and from 1870 to 1872.

They had seven children, including S. F., Nellie, Amos, David, John B. Jr. and Charles G. His wife died in 1875.

[1] His son John B. Jr. was president of Thomas & Thompson, a retail drug business in Baltimore.