Hořín Lock, Navigation lock in Hořín, Czech Republic.

Hořín Lock is a technical monument on the Mělník–Vraňany lateral navigation canal, designed by František Sander and in operation since 1905. It has two adjacent chambers of 137 × 20 m and 73 × 11 m, filled and emptied through bypass channels running along their full length. A 30 kW Francis turbine plant was added in 1996.

The lock was put into operation in 1905, designed by František Sander as part of the Mělník–Vraňany lateral navigation canal. It overcomes a drop of 8.5 m, the highest navigable level on the Prague–Mělník stretch. Between June 2019 and September 2021 the chamber was modified with a lifting mechanism on the stone portal, tested on 18 September 2021.

The lock is a protected technical monument; part of its original equipment is displayed beside the chambers. A small hydroelectric plant with a Francis turbine has operated here since 1996, and the original early-20th-century turbine is now in the Technical Museum in Brno.

The lock sits near the junction where the Vltava and Elbe rivers meet, making it easily accessible. Visitors can best observe the technical systems from the surrounding pathways that allow access to the exterior areas.

The original Francis turbine from the lock was relocated to the Technical Museum in Brno, where it is preserved as an industrial artifact. It demonstrates the innovative machinery that powered this hydroelectric installation.