0 may refer to:

• 0 (number), the integer between -1 and +1
• 0 (year), a year used in some calendar systems
• Slashed zero, a glyph used to distinguish the numeral 0 from the letter O
• 0 or #0, stage name of American musician Sid Wilson, when performing with the band Slipknot
• #0, a Spanish TV channel formerly known as Canal+

0 (zero; BrE: or AmE: ) is both a number and the numerical digit used to represent that number in numerals. It fulfills a central role in mathematics as the additive identity of the integers, real numbers, and many other algebraic structures. As a digit, 0 is used as a placeholder in place value systems. Names for the number 0 in English include zero, nought or (US) naught , nil, or — in contexts where at least one adjacent digit distinguishes it from the letter "O" — oh or o . Informal or slang terms for zero include zilch and zip. Ought and aught , as well as cipher, have also been used historically.

Gonzalo Barrios (born April 17, 1995), known by his gamertag ZeRo, is a Chilean professional Super Smash Bros. player. He is considered the best Super Smash Bros. for Wii U player in the world and a top ranked Super Smash Bros. Brawl player. He mains Diddy Kong and Sheik in Wii U, Pit in Project M, Meta Knight in Brawl, and Fox in Melee.

Zero is the name for both the digit 0 and the number 0.