"Lo Que Pasó, Pasó" (English: What Happened, Happened) is a single by Puerto Rican reggaeton singer-songwriter Daddy Yankee from his third studio album Barrio Fino. It was released in September 2004 by Machete Music and El Cartel Records. It is known to be one of Daddy Yankee's signature songs, and also one of his most successful singles.

The song became Daddy Yankee's third most successful in the United States during 2005, behind "Gasolina" (Hot 100 peak number 32) and "Like You" (Hot 100 peak number 72). The single was almost able to chart on the U.S. Billboard Hot 100, but managed to chart on the Bubbling Under Hot 100 Singles chart at number 6. It was also a major success on the U.S. Billboard Hot Latin Songs chart, peaking in the Top 5 at number 2 and number-one on the Tropical Songs chart where it was the best-performing track of the year. Internationally, it was even able to chart on the Swiss Top 100 Singles Chart at number 35.

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