| Ludwig Barth zu Barthenau | |
| Birth Date: | 17 January 1839 |
| Birth Place: | Rovereto |
| Nationality: | Austrian |
| Work Institutions: | University of Innsbruck |
| Doctoral Advisor: | Heinrich Hlasiwetz |
| Doctoral Students: | Rudolf Wegscheider |
| Known For: | Resorcinol isolation |
Ludwig Barth zu Barthenau (17 January 1839 – 3 August 1890) was an Austrian chemist born in Rovereto.
He studied under Justus von Liebig (1803-1873) in Munich, and in 1867 was appointed professor of chemistry at the University of Innsbruck. In 1876 he succeeded Heinrich Hlasiwetz (1825-1875) as professor of chemistry at the University of Vienna.
He is remembered for his studies of benzol derivatives, and is credited with the discovery of resorcinol. With Adolf Lieben (1836-1914) he founded the journal Monatshefte für Chemie.[1]