Cecelia Olszewski is a composer, producer, violinist, pianist, mezzo-soprano and collaborative artist based in Evanston, Illinois. Her body of work includes chamber opera, small and large ensemble composition, film music, and installation art. 

Her pieces have been performed by the International Contemporary Ensemble, ChamberQUEER, Quartet Iris, Northwestern Contemporary Music Ensemble, Arcana New Music Ensemble, and Cosmia Opera Collective. She graduated from Northwestern University in 2026 with a B.M. in Music Composition and Arts Administration.

Her work positions itself on the threshold between states of being, giving form to liminal spaces through an interdisciplinary, research-based practice. Upcoming projects include commissions from Uniting Voices Chicago and LA Opera.

Cecelia is the founder of Cosmia Opera Collective (@cosmiaoperaco), a student-run organization at Northwestern facilitating the performance of new work by historically-underrepresented composers.