False Widow Spider Identification — Is This a False Widow?
The noble false widow is now one of the most common spiders in homes and gardens across the UK and Ireland, and autumn is when people notice them most. Upload a photo and our free AI tells you in seconds whether it's a false widow or a harmless look-alike.
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How to Identify False Widow Spiders
Check these features before you rely on any single one — the combination is what confirms the ID.
False widows have a round, glossy abdomen, brown to deep purple-black, that looks large compared with the head. That widow-like body shape is where the name comes from.
The noble false widow usually has cream or beige markings on the abdomen, often described as looking like a skull. Markings fade with age, so older females can look almost plain.
The legs are typically reddish-orange to brown and fairly short and stout compared with the long, banded legs of a giant house spider.
A false widow never has the bright red hourglass of a true black widow. If you see a glossy black spider with a red hourglass underneath, treat it as a black widow and don't handle it.
False widows build untidy, tangled webs in sheltered spots like window frames, sheds, fences, garages, conservatories, and behind outdoor lights. They tend to stay in or near the web.
Females have a body around 1 cm long (up to about 14 mm), and males are slimmer and smaller. Including legs, they're far smaller than a giant house spider.
False Widow Look-Alikes
Noble False Widow
Glossy brown-to-purple bulbous abdomen with cream skull-like markings and reddish legs. Bites are uncommon and usually feel like a wasp sting, with pain and swelling; seek medical care if the area becomes hot, spreading, or infected.
Cupboard Spider
A close relative that's darker, glossy purple-black and often without obvious markings, found in cupboards, sheds, and garages. Rarely bites and isn't considered dangerous.
Rabbit Hutch Spider
Smaller false-widow relative with a brown abdomen and a pale band along the front edge, common around sheds and outbuildings. Harmless.
Black Widow
Glossy jet black with a bright red hourglass on the underside. Not established in the UK (occasionally arrives in imported goods), but common in North America. Medically significant bite; don't handle.
Missing-Sector Orb Weaver
Silvery-grey with a leaf-like pattern, building neat orb webs with one empty wedge in window frames. Often confused with false widows on windows. Harmless.
Garden Cross Spider
Brown to orange with a white cross of dots on the abdomen and a large wheel-shaped web in gardens in autumn. Big and noticeable, but harmless.
Giant House Spider
Much larger leg span, long hairy legs, and a fast run across floors, without the glossy bulbous abdomen. Harmless.
Not sure it's a spider at all? Our free picture identifier identifies any insect, spider, or creature from a photo with the same AI.
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Frequently Asked Questions
Sources & References
Our identification guides are researched from the authorities below and reviewed by the IdentifyThis team. AI photo identification is a helpful starting point — for anything involving safety (venomous species, edibility, or medical symptoms), always confirm with a qualified expert before acting.
- CDC — Pest- and health-related guidance
- American Arachnological Society — Spider biology & taxonomy
- BugGuide — Entomology identification community
- UC IPM — University of California Pest Notes
- Smithsonian — Insect & animal biology
Reviewed by the IdentifyThis team · Last updated August 2026