- To be distinguished from his uncle Arnold Mendelssohn (1817–1850), elder son of Moses Mendelssohn's youngest son Nathan (1781–1852). See Mendelssohn family
He was born in Ratibor, Province of Silesia, son of Felix Mendelssohn's cousin Wilhelm Mendelssohn (1821–1866) who had married in 1854 Louise Aimee Cauer (sister to Bertha Cauer). Arnold Ludwig himself married in 1885 his second cousin Maria Cauer, daughter of Carl Cauer (brother of Ludwig Cauer).
Mendelssohn was originally a lawyer before studying music, then was director of church music and a professor in Darmstadt. Paul Hindemith was one of his students. After his death his works were banned in Nazi Germany because of his Jewish heritage. He died in Darmstadt.
Works, editions and recordings
Mendelssohn composed chorale cantatas, three operas, and other works.
- Elsi, die seltsame Magd (op. 8), Oper in 2 Aufzügen. Libretto: Hermann Wette; premier 16 April 1896 Stadttheater Köln
- Der Bärenhäuter (op. 11), Oper in 3 Acts. Libretto: Hermann Wette; premiere 9 February 1900 Theater des Westens in Berlin
- Die Minneburg (1904–07), Oper in einem Akt. Libretto: G. von Koch; premiere 1909 in Mannheim
- Deutsche Messe op.89 SWR Vokalensemble Stuttgart, Frieder Bernius. Hanssler.
- Geistliche Chormusik op.90, Berliner Vokalensemble, Bernd Stegmann. Cantate.
- Françoise Tillard Fanny Mendelssohn 1996 "The composer Arnold Mendelssohn (1855-1933), nephew of the doctor and son of his brother Wilhelm (1855-1933), once observed: "The Mendelssohn family's attitude to Uncle Arnold and Aunt Dorothea is typically Jewish: nobody must think of them."
- "University of North Texas "The Lost Composers"". Archived from the original on 2015-11-18. Retrieved 2016-08-25.
- Karl F. Otto A Companion to the Works of Grimmelshausen 2003 - Page 244 1571131841 "In 1897, the opera Der Bärenhäuter appeared, with a libretto by Hermann Wette and music by Arnold Mendelssohn, a composer from Frankfurt"
- Free scores by Arnold Mendelssohn at the International Music Score Library Project (IMSLP)
- Free scores by Arnold Mendelssohn in the Choral Public Domain Library (ChoralWiki)
- "www.arnold-mendelssohn.de/ - 150th Anniversary Arnold Mendelssohn Website". Archived from the original on December 16, 2014. Retrieved November 16, 2012.
- Trio for 2 Violins & Piano, Op.76 sound-bites & discussion of work
- Trio for 2 Violins & Piano, Op.76 I - Allegro on YouTube
- Trio for 2 Violins & Piano, Op.76 II - Adagio III - Menuet, un poco vivace on YouTube
- Trio for 2 Violins & Piano, Op.76 IV - Sostenuto, allegro non troppo on YouTube