A censer, incense burner, perfume burner or pastille burner is a vessel made for burning incense or perfume in some solid form. They vary greatly in size, form, and material of construction, and have been in use since ancient times throughout the world. They may consist of simple earthenware bowls or fire pots to intricately carved silver or gold vessels, small table top objects a few centimetres tall to as many as several metres high. Many designs use openwork to allow a flow of air. In many cultures, burning incense has spiritual and religious connotations, and this influences the design and decoration of the censer.

Often, especially in Western contexts, "censer" is used for pieces made for religious use, especially those on chains that are swung through the air to spread the incense smoke widely, while "perfume burner" is used for objects made for secular use. The original meaning of pastille was a small compressed mixture of aromatic plant material and charcoal that was lit to release the odour, and pastille-burners were designed for this, for use in the home. Pastilles were made at home until their heyday in the early 19th century, and the burners are often made in pottery or porcelain.

Some types could also be used as pomanders, where the perfume diffuses slowly by evaporation rather than burning.