The Catasauqua Branch was a short railway line in Lehigh and Northampton Counties in the state of Pennsylvania.

Between 1911 and 1912, the Crane Railroad constructed a spur east from Catasauqua a slag dump in Kurtz' Valley; this line included a 735 feet (224 m) tunnel.

[3] The post-World War II decline in coal traffic and the shift of cement haulage from trains to trucks led to the L&NE abandoning operations on October 31, 1961.

[4] The Central Railroad of New Jersey established the Lehigh and New England Railway to acquire some of the L&NE's lines, including 4.4 miles (7.1 km) of the Catasauqua Branch.

[5] The Lehigh and New England Railway suffered from cash-flow problems in the 1970s and was one of many Northeastern railroads included in Conrail in 1976.