Carl Ritter von Ghega, Italian-Austrian engineer, designed the Semmering railway (died 1860)

Karl Ritter von Ghega or Karl von Ghega was an Austrian nobleman and the designer of the Semmering Railway from Gloggnitz to Mürzzuschlag. During his time, he was the most prominent of Austrian railway engineers and architects.

The Semmering railway in Austria, which starts at Gloggnitz and leads over the Semmering to Mürzzuschlag, was the first mountain railway in Europe built with a standard gauge track. It is commonly referred to as the world's first true mountain railway, given the very difficult terrain and the considerable altitude difference that was mastered during its construction. It is still fully functional as a part of the Southern Railway which is operated by the Austrian Federal Railways.