Chamber music with piano (organ)

Violin and piano

1864Romanze G major
Zum 30sten September 1864 (dem 35sten Geburtstag von Engelbert Röntgen)
1865Zum 17ten April 1865
1867Sonata D minor
1873Sonata A major
1876Adagio for violin and organ (zum Palmsonntag 1876)
1877Zwei Stücke, E minor and A minor
1879Variationen über ein nordisches Volkslied op. 21 (originally Variationen über ein norwegisches Volkslied for piano, 1879)
1879-1883Sonata F-sharp minor op. 20
1882Schwedische Weisen und Tänze (by Julius Röntgen and Amanda Röntgen-Maier)
1884Phantasie A minor op. 24
1885Duo A minor
1892Canonische Suite
Aus Jotunheim (also for orchestra, 1892, for French horn and piano, 1902)
5 Canons
1897Oud-Hollandsche Boerenliedjes en Contradansen, 5 volumes
1900Sonate E major op. 40
1904Oud-Nederlandsche Dansen op. 46b (originally Oude Nederlandsche Dansen for orchestra op. 46)
1908Sonata F major (In Erinnerung an Edvard Grieg)
1910Suite in Alt-Holländischer Weise
1917Catrijper Sonata
Bellmannweisen
1917-19185 Morceaux for cello/violin and piano (revised 1922-1924)
1920Romanze
1924Sonata F minor
19257 Vortragsstücke op. 89
Sonata trilogica
1926Schüler-Konzert no. 1 D major op. 85
Schüler-Konzert no. 2 G major op. 88
Een kermisboekje uit 1769
Sonate in zwei Teilen
1927Schüler-Konzert nr. 3 E minor op. 87
1929Suite naar Joh. Walthers Hortulus Chelicus
1930Boerenliedjes uit een oud kermisboekje

Viola and piano

1924Sonata C minor
1925Sonata A-flat major
Sonata A minor

Viola d 'amore and piano

1913Suite Bachiana (also for piano, 1913)

Cello and piano

1872-1873Sonata B-flat major op. 3
1902Sonata A minor op. 41
1903Variationen und Finale über Sankt Nepomuk (originally for French horn and piano, 1903)
1905Sonata G minor
1906Sonata C minor
1907Sonata B minor op. 56
1909Phantasie über irische Volkslieder (also for cello and orchestra, 1928)
1914-1915Sonata D major
1917Sonata F-sharp minor
1917-19185 Morceaux for cello/violin and piano (revised 1922-1924)
1926Sonata D minor
1927Sonata E minor
Sonata C minor
1930Sonata D minor
Sonata A minor
1931Sonata C-sharp minor
Sonata C major
1932Variationen über ein Alt-Englisches Volkslied

Wind instrument and piano

1902Aus Jotunheim, Suite über norwegische Volksweisen for French horn and piano (originally violin and piano, 1892)
1903Variationen und Finale über Sankt Nepomuk for French horn and piano (also for cello and piano, 1903)
1918Sonata 1 F-sharp minor for oboe and piano
1928Sonata 2 D major for oboe and piano
1929Sonata A-flat major for bassoon and piano

Piano trio (violin cello piano)

1883Trio B-flat major op. 23
1898Trio D major Trio G minor
1904Trio C minor op. 50
1919Trio A minor (Troldhaug)
1921Trio F-flat minor (in one part)
1924Trio F minor (Post Tenebras Lux)
Gaudeamus Trio A major
1932Trio G minor
Trio C minor
Trio E minor
Trio E-flat major
Trio G minor

Piano trio

1921Trio E-flat major für Clarinette, Bratsche und Klavier

Piano quartet (two violins cello and piano)

1898Walzer (originally for piano four hands, 1884)
1927De Hellevaart van Dr. Joan Faustus
1928Rei van Helsche Vrouwengeesten

Piano quartet (violin, viola, cello and piano)

1919Quartet A major
1931Quartet G minor

Piano quintets

1903Quintet C major (2 violins, viola, cello, piano)
1911Quintett für Flöte, Oboe, Klarinette, Horn und Klavier
1927Quintet in A minor op. 100 (2 violins, viola, cello, piano)
1932Quintet G major (Sentendo nuova forza, 2 violins, viola, cello, piano) [final work, 5-7-1932]