Billion may refer to:

In numbers:

• Billion (word), explanation of long and short scales
• 1,000,000,000 (number), one thousand million, 10⁹, in the commonly used "short scale"
• 1,000,000,000,000 (number), one million million, 10¹², in the "long scale"

In other usage

• Billion (company), a modem manufacturer
• Billion Girl, a shōjo manga series
• Golden billion, a Russian term for the wealthy people of the developed world
• Jack Billion (born 1939), the 2006 Democratic Party candidate for governor of South Dakota

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