The deadliest spider in the world is generally considered to be the Sydney funnel-web spider (Atrax robustus), a highly venomous species native to Australia. Its venom attacks the nervous system and can cause severe symptoms within minutes, including muscle spasms, breathing difficulty, and dangerously high blood pressure. Several human deaths from the bites of these aggressive spiders have been recorded in the Sydney area since the 1920s.
Read Britannica’s list “9 of the World’s Deadliest Spiders.”