Belus or Belos is a small river in Israel, where according to legend glass-making was invented.

This river, also called Pagida by Pliny the Elder (N.H. 5.19), flowed from Lake Cendevia (now below Mount Carmel) for five miles to the sea near Ptolemais Ace. It was celebrated for its vitrous sands. It is now called Nahr Na'mân.