Sewer commonly refers to a part of sewerage, the infrastructure that conveys sewage.

Types of sewers include:

• Combined sewer
• Effluent sewer
• Gravity sewer
• Sanitary sewer
• Storm sewer
• Vacuum sewer

Other uses:

• Sewer, one who does sewing

• Sewage, wastewater produced by a community of people
• Sewer overflow (disambiguation)