My vote goes first to the engineering department, who stayed down in the bowles of the ship, keeping her dynamos and power going, and working to the very end to keep her lights on and her power to transmit her distress signals. They even worked after chief engineer Bell released them. Most of them did not survive.

My second vote goes to Jack Phillips and Harold Bride, even though there is a question of responsibility in them not delivering the urgent ice warning to the captain.

Phillips sent CQD and SOS until he could transmit no longer, and was responsible for getting the Carpathia's attention. He died soon after he was taken about callapsable B.

After the Carpathia picked up the survivors, Harold Bride worked day and night until he collapsed from exhaustion sending in the names of precious few who survived. He worked even though he was not well, and could not walk because his feet were badly frost-bitten.

My third vote goes to Captain Rostron of the Carpathia, who risked his own ship by running it at full speed through and ice field to save the 705 people that survived.

But furthermore, there are countless other people that could and should be noted as heros (The Band as stated by lilcandycane).

I think arguably even the officers (Wilde Murdoch, Lightoller, Pitman, Boxhall, Lowe, and Moody), deserve their praise for helping save as many people as they did under the circumstances and mindset of that time. I think, one by one, they started to realize how critical the situation was, and corrected their mistakes.

And after Captain Smith kind of went into a state of shock and arguably lost his ability to command, the senior officers like Lightoller steped up and took command of their own.