In physics and electrical engineering

• Electrical filament
• Current filament
• Filament propagation, diffractionless propagation of a light beam
• Hot cathode, a filament in a vacuum tube that emits electrons

In astronomy

• Galaxy filament
• Solar filament, a structure in a solar corona
• Birkeland current

In biology

• Protein filament
• Filamentation, a long chain of cells
• Part of a stamen, the male part of a flower
• Hypha, in fungi and Actinobacteria

In music

• Filament (band), collaborative project between Otomo Yoshihide and Sachiko M.

Other uses

• Fiber or yarn
• Filament (textiles), clusters or locks of wool fibers
• 2002 movie by Jinsei Tsuji

See also

• Monofilament

filament(plant)