Thiersch is a German surname. People named Thiersch include:
Friedrich Thiersch (1784–1860), German classicist and philhellene Friedrich von Thiersch (1852–1921), German architect and painter H. W. J. Thiersch (1817–1885), German theologian in the Catholic Apostolic Church, and son of Friedrich Katharina Thiersch (1938–2021), German monument conservator Karl Thiersch (1822–1895), German surgeon, and son of Friedrich Ludwig Thiersch (1825–1909), Germanpainter, philhellene, and son of Friedrich Paul Thiersch (1879–1928), German architect