United States twenty-dollar bill

The United States twenty-dollar bill ($20) is a denomination of U.S. currency. The seventh U.S. President (1829–37), Andrew Jackson has been featured on the front side of the bill since 1928, which is why the twenty-dollar bill is often called a "Jackson," while the White House is featured on the reverse side.

The twenty-dollar bill in the past was referred to as a "double-sawbuck" because it is twice the value of a ten-dollar bill, which was nicknamed a "sawbuck" due to the resemblance the Roman numeral for ten (X) bears to the legs of a sawbuck, although this usage had largely fallen out of favor by the 1980s. The twenty-dollar gold coin was known as a "double eagle". Rather than a nickname, this nomenclature was specified by an act of Congress.

As of December 2013, the average circulation life of a $20 bill is 7.9 years before it is replaced due to wear. Approximately 11% of all notes printed in 2009 were $20 bills. Twenty-dollar bills are delivered by Federal Reserve Banks in violet straps.