The word Rod may have one of the following meanings.
- A rod is a straight and slender stick; a wand; hence, any slender bar, as of wood or metal (applied to various purposes).
- Rods are light-sensitive cells in the retina of the eye. See rod cell.
- The rod is an Imperial unit of length, also known as the pole or perch. It is equal to 5.5 yards or 16.5 feet; 5.029 metres.
- The rod is supposedly a species of creature that flits about in the air at such a high speed as to not be seen by the naked eye, but which can be caught on video. See: Rod (cryptozoology).