There are several spiders that can kill humans, but it is important to note that deaths from spider bites are rare. Here are some of the most dangerous spiders:

• Brazilian Wandering Spider: Also known as the banana spider, this spider is considered to be the deadliest of all the worlds spiders. Its venom is toxic to the nervous system and can cause symptoms such as salivation, irregular heartbeat, and prolonged, painful erections in men.

• Sydney Funnel-Web Spider: According to the Guinness World Records, this spider is the most dangerous spider to humans in the world. Its venom potency is 0.2 mg/kg as a lethal dose for humans.

• Redback Spider: This spider is also known as the Australian black widow and is responsible for more envenomations requiring antivenom treatment than any other animal in Australia. Its venom affects the nervous system and can cause intense pain, severe sweating, and vomiting.

• Black Widow Spider: This spider is found in the United States and is considered venomous to humans. Its venom can cause muscle aches, nausea, and paralysis of the diaphragm, which makes breathing difficult.

• Brown Recluse Spider: This spider is also found in the United States and is considered venomous to humans. Its bite can cause severe muscle pain and cramping, nausea, and mild paralysis of the diaphragm.

It is important to note that most spiders are venomous, but venomous does not necessarily mean dangerous to humans.