| Long title | An Act to promote the welfare of American seamen in the merchant marine of the United States; to abolish arrest and imprisonment as a penalty for desertion and to secure the abrogation of treaty provisions in relation thereto; and to promote safety at sea. |
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| Enacted by | the 63rd United States Congress |
| Effective | November 4, 1915 |
| Citations | |
| Public law | 63-302 |
| Statutes at Large | 38 Stat. 1164 |
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| Merchant Marine Act of 1920 | |
The Seamen's Act, formally known as Act to Promote the Welfare of American Seamen in the Merchant Marine of the United States or Longshore and Harbor Workers' Compensation Act[citation needed] (Act of March 4, 1915, ch. 153, 38 Stat. 1164), was designed to improve the safety and the security of United States seamen and to eliminate shanghaiing.
"The 1915 statute... has been described as the Magna Carta of American sailors' rights."

| Admiralty and maritime law |
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| Contract of carriage / charterparty |
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Trade unions like the International Seamen's Union (ISU) provided much of the impetus for the bill, which was further promoted by the increasing international tensions in the years preceding World War I. The bill was first proposed in 1913 but became a law after the beginning of hostilities in Europe, though before the United States joined the conflict. The sinking of the RMS Titanic in 1912 raised the issue of safety at sea and became a political issue as well.
The Act was sponsored by U.S. Senator Robert M. La Follette. The ISU had a significant influence on the drafting of the bill, with its president, Andrew Furuseth, cited as being behind the bill's intent and content. U.S. Secretary of Labor William B. Wilson supported the bill's passage.

The law was the culmination of twenty years of agitation by Furuseth. U.S. President Woodrow Wilson had supported such a bill at the beginning of his administration, but in late 1913, U.S. Secretary of State William Jennings Bryan had been negotiating with the British for a Convention on Safety at Sea Treaty, which would have established international, rather than national, standards for the treatment of sailors on ships. The Senate ratified the Bryan Conciliation Treaty on August 27, 1914, and Bryan urged Wilson to use a pocket veto for the La Follette Bill. Furuseth came to Washington and literally begged Wilson to sign the bill.
Bryan was nearly moved to tears since he realized the sincere determination and conviction of a man who had labored for such legislation for decades, and Wilson signed it into law. Explaining his signing of the bill, Wilson said that he did so "because it seemed the only chance to get something like justice done to a class of workmen who have been too much neglected by our laws."
The law was designed to promote the living and working conditions of seamen serving in the U.S. Merchant Marine. It applied to vessels in excess of 100 gross tons excluding river craft.
The law included provisions to:
The Act did little to help seamen who were injured in the course of their duties, and the Merchant Marine Act of 1920, commonly known as the Jones Act, was passed in an attempt to address such incidents.[citation needed]
Shipowners generally opposed the Seamen's Act and the Jones Act as excessive and unnecessary interference with the freedom of contract. They responded by pioneering the now-common practice of chartering ships overseas under flags of convenience.[citation needed] Shipping companies claimed that the unhappy result was the crippling of America's merchant marine, as freight rates spiraled upward with crews' wages.[citation needed]
At least one company, the Pacific Mail Steamship Company, ceased operations in the Far East and declared that the increased cost of English-speaking crews would make it uncompetitive against foreign companies without such restrictions.