Louis Henry (German: Ludwig Heinrich) (11 October 1640 - 3 January 1674) was the Count Palatine of Simmern-Kaiserslautern from 1653 until 1673.

Louis Henry was born in 1640 as the only surviving son of Louis Philip, Count Palatine of Simmern-Kaiserslautern. He succeeded his father in 1655, and was under the regency of his mother, Marie Eleonore von Brandenburg, till 1658. He retired from ruling in 1673. He died less than a year later, and was buried in the St-Stephan's Church in Simmern.^[1]

Louis Henry married Maria of Orange-Nassau (5 September 1642 - 20 March 1688) in 1666, daughter of the Dutch prince Frederick Henry. The marriage remained childless.