A lineman or linesman may be:

• In the utilities industries, a lineman or linesman is somebody who constructs and maintains electrical transmission and distribution lines, telephone lines, cable TV lines, or, in the past, telegraph wires.
• In American football, a lineman is a frontline offensive or defensive position.
• In football (soccer), a linesman or lineman is an Assistant referee.
• A linesman (ice hockey), an on-ice match official.
• Linesman is a common colloquial term for a tennis line umpire.