Violin Sonata No. 18 in G major (K. 301/293a) was composed by Wolfgang Amadeus Mozart in March 1778 in Mannheim, Germany, and was first published in the same year as part of Mozart's Opus 1 collection, which was dedicated to Countess Palatine Elisabeth Auguste of Sulzbach and are consequently known as the Palatine Sonatas (Kurfürstin Sonaten).

The work consists of two movements: