Spednic Lake (sometimes Spednik Lake or Spednick Lake) is a mesotrophic lake in the Chiputneticook Lakes chain along the Canada–United States border between the state of Maine and the province of New Brunswick that is best known for its bass fishing. Sometimes it is viewed as the headwaters of the St. Croix River, sometimes a lake further up the chain is considered the headwaters. The international border runs through the lake. A northeastern arm of the lake, located entirely in Canada, retains the name Palfrey Lake. Prior to dam construction that expanded Spednic Lake they were separate lakes, but now they are hydrologically and ecologically a single combined lake.