Sealer may refer either to a person or ship engaged in seal hunting, or to a sealant; associated terms include:

• Sealer Hill, South Shetland Islands, Antarctica
• Sealers' Oven, bread oven of mud and stone built by sealers around 1800 near Albany, Western Australia
• Sealers Passage, marine channel in the South Shetland Islands, Antarctica
• Sealers' War, conflict in southern New Zealand started by sealers in 1810

• Concrete sealers, products applied to concrete to protect it from corrosion
• Heat sealer, machine using heat to seal products
• Stone sealer, surface treatment product to retard staining and corrosion in natural stone

• Seal (disambiguation)
• Sealing (disambiguation)