The International Brotherhood of Boilermakers, Iron Ship Builders, Blacksmiths, Forgers and Helpers (IBB) is a trade union in the United States and Canada.

Because helpers were barred from sitting in the lodge room with mechanics, this new division had its own local unions and was entirely separate from the Boiler Makers.

In March 1906, at a special Convention in Kansas City, the name of the Union was changed to the International Brotherhood of Boilermakers, Iron Ship Builders and Helpers of America in order to incorporate the newest division.

At the turn of the century, total membership stood at about 8,500, but by 1944, due in part to dramatic increases in the shipbuilding, railroad, and fabrication shop industries during World War II, the Boilermakers numbered over 350,000.

On October 1, 1994, a merger was consummated with the Stove, Furnace and Allied Appliance Workers' International Union—a skilled trade union that was organized in 1891.

This one-local union, formed in 1978 with members employed in the coal strip-mining, signed a merger agreement with the Boilermakers effective December 1, 1994.

In October 1996, a merger agreement was made with the Metal Polishers', Buffers', Platers' and Allied Workers' International Union.

In October 2022, the International Executive Council voted unanimously to elect Simmons to fill the IVP-Southeast Section vacancy, effective February 1, 2023, upon the retirement of Warren Fairley.

(Fairley briefly came out of retirement to serve the union as International President during a time of transition after Newton Jones was removed from the role.)