The largest organ in the world is a matter of interpretation, depending on whether you mean the largest organ in a human body or the largest musical instrument.
Largest Organ in a Human Body
The largest organ in the human body is the skin. Multiple sources confirm this. For example, this article on Healthline and this PubMed article both state that the skin is the body's largest organ. It covers the entire body and plays a vital role in protection, temperature regulation, and sensation.
Largest Pipe Organ in the World
Several sources claim different pipe organs as the largest in the world. This ambiguity highlights the challenges of defining "largest" based on different metrics (number of pipes, weight, etc.).
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Some sources cite the Boardwalk Hall Auditorium Organ in Atlantic City, New Jersey, as the largest pipe organ ever constructed. This article on AtlanticCityNJ.com supports this claim, emphasizing its size and weight. The Atlantic City Experience website further details its construction and scale. World Record Academy also lists it as the largest.
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Other sources name the Passau Cathedral Organ in Germany as the world's largest. Vox Humana mentions the Midmer-Losh organ at Boardwalk Hall, but other articles like Mixtuur and the Passau Tourism website highlight the Passau Cathedral organ and its impressive number of pipes. Wikipedia's list of pipe organs also mentions the Passau organ as one of the largest. A further source, Classical Music, points to the Wanamaker Organ in Philadelphia, but doesn't clearly claim it to be the largest.
The discrepancy arises from the different criteria used to determine "largest." The question needs to specify whether it refers to human organs or musical instruments to provide a definitive answer.