• Prelude for piano (1992)
• Conjugation for mezzo-soprano and piano to the text by Halina Poświatowska (1992)
• Elegy for cello and piano (1993)
• Two Miniatures for string trio (1993)
• Colorful Road for percussion ensemble (1994)
• Dialogues for two violas (1994)
• Improvisation for flute solo (1994)
• Fantasy for guitar solo (1994)
• Trio for reed instruments (1995)
• Verses for string quartet (1996)
• Da suonare a tre for viola, cello and piano (1996)
• Concertino da camera for violin solo, cello solo and string orchestra (1996)
• Cantus. Choral Fantasy for symphony orchestra (1997)
• Concerto for violin and orchestra (1997)
• Dialogues 2 for viola and cello (1997)
• Music for the film Via Dom, directed by Gabriel Buday (1997)
• Capriccio for violin and piano (1998)
• String Quartet No. 2 (1998)
• Divertimento for string orchestra (1998)
• Sonata in modo antico for brass quintet (1999)
• Lullaby for brass quintet (1999)
• Sunny Songs for cello ensemble (1999)
• Ragtime for brass quintet (2000)
• Intermezzo. Adagio for string quartet (2000)
• Epigraf for alto flute solo (2000)
• Psalm (after Cyprian Basilicus) for mixed choir (2000)
• Da suonare a tre for violin, cello and piano (2001)
• Sonores for flute, cello and guitar (2001)
• Elegy for violin solo and orchestra (2001)
• Litaniae de Beatae Mariae Virginis for mezzo-soprano and organ (2002)
• Lullaby for M. for piano quintet (2002)
• Two Melodies for violin and piano (2003)
• String Quartet No. 3 (2003)
• Litany for mixed choir a cappella (2003)
• Sequentia for Prof. F. Wesołowski on the 90th anniversary of his birth for strings and organ (2004)
• Sonata for cello solo (2004)
• Locus solus for cello octet (2004)
• Rainbow for a 4-part children's choir (2004)
• Musica anniversaria for 4 trumpets, 3 trombones and tuba (2004)
• Thyrsos for percussion, 3 trumpets, 2 horns and 2 trombones (2004)
• String Quartet No. 4 (2004)
• Three Old Polish Psalms for mixed choir a cappella (2005)
• Miniature for cello and piano (2006)
• Nocturnes for violin, cello and piano (2006-2007)
• Arabesque for string quartet (2007)
• Kreuzeriana – page from the school album for string orchestra (2007)
• Elegiac Preludes for flute and string quartet (2007)
• Cello Concerto for right hand (2007-2008)
• String Quartet No. 5 (2008)
• Recitativo e Arioso for string instrument (2009)
• Musica festiva for brass trio (2009)
• Music for trumpet and percussion (2009)
• Pianocello sonata for cello and piano (2010-2011)
• Locus solus, version for string quartet (2011)
• Zmyślenia 2 for string orchestra (2011)
• Double Concerto for percussion, cello and orchestra (2012)
• Arabesque for chamber orchestra (2012)
• Entelecheia, symphony concertante for cello, percussion and orchestra (2012)
• Let's play - for Evelyn and Dominik  for marimba and cello (2013)
• Elegiac Preludes No. 2 for flute, alto flute and orchestra (2013)
• Paths, paths, suite with folk themes for children's choir and orchestra (2014)
• Chwila z muzyką for violin, cello and piano (2014)
• Music for the film 6 Films About Love, directed by Marcin Kopeć, Natalia Krasilnikova, Tomasz Blachnicki, Aleksandra Rek, Paweł Ziemilski and Matej Bobrik (2015)
• Nie pójdę tą ścieżką for voice and piano (2016)
• Ciemne i szare naoczności for accordion solo (2023)

Kowalska-Zając Ewa, Hans Olga, Akademia Muzyczna w Łodzi, Łódź 2001