Some of the most dangerous rattlesnakes in the world include the Eastern Diamondback Rattlesnake, the Western Diamondback Rattlesnake, and the Mojave Rattlesnake. Out of these, the Eastern Diamondback is considered to be the most venomous species found in North America. On the other hand, the Mojave Rattlesnake's venom is considered the most potent amongst all rattlesnake species. It's worth noting that the the Western rattlesnake or Diamondback is responsible for the most snakebite fatalities in Mexico and the second most in the US.