The old water tower is a historic water tower belonging to the municipal water supply network of Bydgoszcz, Poland. Its importance in the local history has been acknowledged in 1986 by a registering on the Kuyavian-Pomeranian Voivodeship Heritage List.

A water tower is an elevated structure supporting a water tank constructed at a height sufficient to pressurize a distribution system for potable water, and to provide emergency storage for fire protection. Water towers often operate in conjunction with underground or surface service reservoirs, which store treated water close to where it will be used. Other types of water towers may only store raw (non-potable) water for fire protection or industrial purposes, and may not necessarily be connected to a public water supply.