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Trapdoor spider is a common name that is used to refer to various spiders from several different groups that create burrows with a silk-hinged trapdoor to help them ambush prey.

Several families within the infraorder Mygalomorphae contain trapdoor spiders:

• Actinopodidae, a family otherwise known as 'mouse-spiders', in South America and Australia
• Antrodiaetidae, a family of 'folding trapdoor spiders' from the United States and Japan
• Barychelidae, a family of 'brush-footed trapdoor spiders' with pantropical distribution
• Ctenizidae, a family of 'cork-lid trapdoor spiders' in tropical and subtropical regions
• Cyrtaucheniidae, a family of 'wafer-lid trapdoor spiders, with wide distribution except cooler regions
• Euctenizidae, a family of spiders that make wafer-like or cork-like trapdoors
• Halonoproctidae, a family of spiders that make wafer-like or cork-like trapdoors and includes the phragmotic genus Cyclocosmia
• Idiopidae, a family of 'spurred-trapdoor spiders' or 'armoured trapdoors' mostly in Southern Hemisphere
• Migidae, also known as 'ridge fanged trapdoor spiders' or 'tree trapdoor spiders', in the Southern Hemisphere
• Nemesiidae, a family of 'tube trapdoor spiders', with both tropical and temperate species worldwide
• Theraphosidae, a family of tarantulas (where just a few species make trapdoors), also with wide distribution

There is also one family of trapdoor spiders in the suborder Mesothelae:

• Liphistiidae, a family of spiders with armoured abdomens from Southeast Asia, China and Japan

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