"Azúcar Amargo" (Bitter sugar) is a Latin pop song sung by Mexican singer Fey. The song's title means "Bitter Sugar" in English, but is used in the context of the English term . This is apparent since the song is about a relationship which brings her both joy and pain. The song was released in November 1996 as the first single from Fey's second album, Tierna la Noche, and quickly became her biggest hit to date.

The music video was directed by Luis de Velasco and premiered on October 1996. In the video Fey is drawing a guy in a room while it's raining, then she is dancing down the rain and is singing the song, the video ends with Fey standing in the floor down the rain then appears a message in a black found that says: "La magia existe apesar de la realidad no temas verla" in English is "Despite reality, magic exists. Don't be afraid to see it".

After the album was released in early November 1996, the song quickly positioned itself in the Mexican Top 10 and climbed to number one in only four weeks, lasting 14 weeks at that spot. The song also peaked at number one in all Central American nations, as well as in Colombia and Chile and became a Top 10 single in all of South America, including Brazil, prompting the release of Tierna la Noche in Portuguese. In the U.S., the song fared well, as it managed to stay on the Billboard Hot Latin Tracks chart for over 40 weeks, peaking at number 8.

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