Activated alumina is a desiccant and filter manufactured from aluminium hydroxide by dehydroxylating it in a way that produces a highly porous material. This material can have a surface area significantly over 200 square metres/g. It has a very high surface-area-to-weight ratio, due to the many "tunnel like" pores that it has.

The compound is used as a desiccant (to keep things dry by absorbing water from the air) and as a filter of fluoride, arsenic and selenium in drinking water. It serves as a selective adsorbent for many chemicals including the removal of sulfur from gas streams.

In high vacuum applications, activated alumina is used as a charge material in fore-line traps to prevent oil generated by rotary vane pumps from back streaming into the system.

Its mechanical properties and non-reactivity in the biological environment allow it to be a suitable material used to cover surfaces in friction in body prostheses (e.g. hip or shoulder prostheses).

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