Who is the patron saint of pirates? NOBODY! They were scurvy dogs, the lot of them. But there are several patron saints of sailors, including:
St. Nicholas - While yet a young man, Nicholas followed the example of his uncle, the abbot, by making a pilgrimage to the birthplace of Christianity—the Holy Land. Desiring a serene time of preparation, Nicholas set sail on an Egyptian ship where the other pilgrims did not know who he was. The first night he dreamed a storm would put them all at peril. When he awoke in the morning he warned the sailors that a severe storm was coming, but they need not fear, for "God will protect us." Almost immediately the sky darkened and strong winds roared round the ship. The wind and waves made it impossible to keep the ship under control. Even with lowered sails, the sailors feared for their very lives and begged Nicholas to pray for safety. One sailor climbed the main mast, tightening the ropes so the mast would not crash onto the deck. As he was coming back down, the sailor slipped, fell to the deck, and was killed. While Nicholas prayed, the storm did quiet, relieving the sailors. Their comfort, however, was dampened by grief over their comrade's death. As Nicholas prayed over the dead sailor, he was revived, "as if he had only been asleep." The man awakened without pain and the ship finished the journey to the Holy Land. Nicholas then embarked on his pilgrimage to the holy places, walking where Jesus had walked.
St. Brendan -Brendan the Navigator or Brénainn moccu Alti as he is often known in the medieval Irish tradition is the patron Saint of two Irish Dioceses, Kerry and Clonfert. He is also a patron saint of boatmen, mariners, travelers, elderly adventurers, and whales,and also of portaging canoes.
Christian saint and martyr, according to Christian tradition, who died c. 303. He is venerated as the patron saint of sailors and abdominal pain. St Erasmus or Elmo is also one of the Fourteen Holy Helpers, saintly figures of Christian tradition who were venerated especially as intercessors.