Philipp, Duke of Saxe-Merseburg-Lauchstädt (26 October 1657 – 1 July 1690) was a German prince.
He was a member of the House of Wettin.
He was born in Merseburg, the fifth but third surviving son of Christian I, Duke of Saxe-Merseburg and Christiana of Schleswig-Holstein-Sonderburg-Glücksburg.