The String Quintet No. 1 in B flat major, K. 174, was written by Wolfgang Amadeus Mozart in December 1773. Unlike Mozart's other viola quintets which are scored for two violins, two violas and cello- this early work is scored for two violins, two violas and basso.

Date of composition 1773
First published 1798 – Vienna: Johann Traeg (parts)
Type String Quintet
Tonality B-flat Major
Catalogue KV 174
Instruments Cello
2x Viola
2x Violin
Autotranslations beta Wolfgang Amadeus Mozart: Quintette à cordes n°1 en si bémol majeur, KV 174
Wolfgang Amadeus Mozart: Quintetto d'archi n. 1 in si bemolle maggiore, KV 174
Wolfgang Amadeus Mozart: Streichquintett Nr. 1 B-dur, KV 174