NLX may refer to:
ISO 639-3 code for the Kalto language nanolux, an SI unit of illumination equal to 10−9 lux NLX (motherboard form factor), a form factor standard for low profile retail PCs NLX LLC, a software company acquired by Rockwell Collins in 2003 Nonlinear X-wave, a multi-dimensional wave that can travel without distortion Northern Lights Express, a proposed passenger rail service between Minneapolis and Duluth, Minnesota Railroad reporting mark for Allied Corporation from 1963 - 1985