Jacob Horwitz (or Horowitz) (1830 – 24 March 1920) was a politician in Queensland, Australia.
Horwitz was born in 1830 in East Prussia (now part of Poland).
He resigned in 1878 to successfully contest the seat of Warwick in the Queensland Legislative Assembly.
[3] A member of the Liberal party, Horwitz was elected to the seat in 1878, defeating James Morgan who was dying from an injury sustained some months earlier.
Horwitz was a prominent philanthropist in the Darling Downs region, including gifting £7500 to the Warwick General Hospital for the creation of a new ward.