Between skating around on the hard ice and banging into your opponents, hockey is one heck of a contact sport. You'll want the full gamut of protective gear to make sure you stay unharmed and safe. So starting from head to toe: you'll need a helmet, a mouth guard, shoulder pads, knee pads, elbows pads.... as you continue to make a list it's kind of terrifying to even consider playing the sport.
Extra Protection
Don't forget about the soft spots most normal protective pads don't cover. Fortunately for hockey players, there are throat protectors and ankle guards available as well. And if you're not a female hockey player, consider investing in a hockey jock because you never know where a stick or puck will land. Itech has a good selection of these to look into. Never underestimate the process of testing out your gear before you commit to it. You'll want to make sure that your gear fits you well without keeping you from easy movement. This is especially true for your helmet, if it decreases visibility at all then find another.
