Bill may refer to:

This section includes only individuals whose last name is Bill, or whose only generally-known name is Bill.

Bill is a common nickname for William. See William (name) for more information on the history of the name William. People known as Bill include:

Watercolor (American English) or watercolour (Commonwealth and Ireland), also aquarelle from French, is a painting method. A watercolor is the medium or the resulting artwork in which the paints are made of pigments suspended in a water-soluble vehicle. The traditional and most common support for watercolor paintings is paper; other supports include papyrus, bark papers, plastics, vellum or leather, fabric, wood, and canvas. Watercolors are usually transparent, and appear luminous because the pigments are laid down in a relatively pure form with few fillers obscuring the pigment colors. Watercolor can also be made opaque by adding Chinese white. In East Asia, watercolor painting with inks is referred to as brush painting or scroll painting. In Chinese, Korean, and Japanese painting it has been the dominant medium, often in monochrome black or browns. India, Ethiopia and other countries also have long traditions. Fingerpainting with watercolor paints originated in china.

Although watercolor painting is extremely old, dating perhaps to the cave paintings of paleolithic Europe, and has been used for manuscript illumination since at least Egyptian times but especially in the European Middle Ages, its continuous history as an art medium begins in the Renaissance. The German Northern Renaissance artist Albrecht Dürer (1471–1528) who painted several fine botanical, wildlife and landscape watercolors, is generally considered among the earliest exponents of the medium. An important school of watercolor painting in Germany was led by Hans Bol (1534–1593) as part of the Dürer Renaissance.

Bill Kaulitz (born 1 September 1989 in Leipzig, German Democratic Republic) is a German singer, songwriter, voice actor, designer and model. He is best known for his work from 2001 to the present as the lead singer of the band Tokio Hotel.

Bill Kaulitz was born on 1 September 1989 in Leipzig, German Democratic Republic. He has an identical twin brother, Tom, who is older by ten minutes. His parents, Simone and Jörg Kaulitz, separated when Kaulitz and his brother were seven years old. Simone married Gordon Trümper, the guitarist from the German rock band Fatun on 1 August 2009, after dating for 12 years.

Kaulitz showed an early interest in singing, as did Tom in playing guitar. Trümper noticed the twins' musical inclinations, and helped the twins to start their own band. According to Kaulitz in several interviews, he and Tom started writing music at the age of seven years old.

At the age of ten the brothers began performing live in Magdeburg, near their hometown of Loitsche, under the pseudonym Black Question Mark. They played small shows and while their audiences enjoyed them, they were largely unknown. The band lacked a drummer and bass player and the twins relied on a keyboard to fill in other instrumental sounds.