A sinfonietta is a musical group that is larger than a chamber ensemble but smaller than a full-size or symphony orchestra.
There are many orchestras called sinfonietta. Some groups are still a sinfonietta despite not including the word in their name:
Alarm Will Sound
American Modern Ensemble
Amsterdam Sinfonietta
American Sinfonietta
Athelas Sinfonietta Copenhagen
Basel Sinfonietta
Bournemouth Sinfonietta
Chicago Sinfonietta
Danish National Chamber Orchestra, also known as the Danish Radio Sinfonietta
Hong Kong Sinfonietta
Hull Sinfonietta
Imperial College Sinfonietta
Israel Beersheba Sinfonietta
KLPac Sinfonietta
Kymi Sinfonietta
Lake Placid Sinfonietta
Sinfonietta de Lisboa
Lancashire Sinfonietta
London Sinfonietta
Luxembourg Sinfonietta
Sinfonietta Nova Arnstadt
Kyiv Sinfonietta
Oslo Sinfonietta
Rome Sinfonietta
Royal College of Music Sinfonietta
San Francisco Sinfonietta
Siam Sinfonietta
Southampton Youth Sinfonietta Orchestra
Stockholm Sinfonietta
Tapiola Sinfonietta
