The Lieutenant River is a 3.7-mile-long (6.0 km)  tidal river located in Old Lyme, Connecticut. It joins the Connecticut River in the estuary, just above the point where that river flows into Long Island Sound.
The river has a public boat launch and is a popular fishing spot. 
The Lieutenant River is popular among artists and photographers. A number of American impressionist artists, including Childe Hassam, painted views of the river while staying at the Florence Griswold House in Old Lyme.  
- U.S. Geological Survey. National Hydrography Dataset high-resolution flowline data. The National Map Archived 2012-04-05 at WebCite, accessed April 1, 2011
- "Archived copy". Archived from the original on 2010-06-23. Retrieved 2009-06-19.
- "Archived copy". Archived from the original on 2012-07-11. Retrieved 2009-06-19.
- The Griswold Celebrates New Space and New Art , William Zimmer, June 30, 2002, New York Times https://query.nytimes.com/gst/fullpage.html?res=9900EEDB143EF933A05755C0A9649C8B63&sec=&spon=&pagewanted=all
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