"Happy Birthday to You", also known more simply as "Happy Birthday", is a song that is traditionally sung to celebrate the anniversary of a person's birth. According to the 1998 Guinness Book of World Records, "Happy Birthday to You" is the most recognized song in the English language, followed by "For He's a Jolly Good Fellow". The song's base lyrics have been translated into at least 18 languages.^{, p. 17}

The melody of "Happy Birthday to You" comes from the song "Good Morning to All", which was written and composed by American siblings Patty Hill and Mildred J. Hill in 1893. Patty was a kindergarten principal in Louisville, Kentucky, developing various teaching methods at what is now the Little Loomhouse; Mildred was a pianist and composer.^{, p. 7} The sisters created "Good Morning to All" as a song that would be easy to be sung by young children.^{, p. 14}

Happy Birthday may refer to:

Stevland Hardaway Morris (born May 13, 1950 as Stevland Hardaway Judkins), known by his stage name Stevie Wonder, is an American singer, songwriter, and multi-instrumentalist, a child prodigy who developed into one of the most creative musical figures of the late 20th century. Blind since shortly after birth, Wonder signed with Motown's Tamla label at the age of eleven, and continues to perform and record for Motown to this day.

Among Wonder's best known works are singles such as "Superstition", "Sir Duke", "I Wish" and "I Just Called to Say I Love You". Well known albums also include Talking Book, Innervisions and Songs in the Key of Life. He has recorded more than thirty U.S. top ten hits and received twenty-two Grammy Awards, the most ever awarded to a male solo artist. Wonder is also noted for his work as an activist for political causes, including his 1980 campaign to make Martin Luther King, Jr.'s birthday a holiday in the United States. In 2009, Wonder was named a United Nations Messenger of Peace. In 2008, Billboard magazine released a list of the Hot 100 All-Time Top Artists to celebrate the US singles chart's fiftieth anniversary, with Wonder at number five.