Peta is a feminine given name which may refer to:

• Peta Bala'c (born 1953), English football goalkeeper
• Peta Brady (born 1972), Australian actress
• Peta Buscombe, Baroness Buscombe (born 1954), English barrister and politician
• Peta Credlin (born c. 1970), Australian political advisor and Chief of Staff
• Peta Doodson (born 1955), Australian television actress
• Peta Edebone (born 1969), Australian softball player and Olympic medalist
• Peta Gallagher (born 1977), Australian field hockey striker
• Peta Hewitt, creator of the web and print comic Terinu
• Peta Lily (Peta Wilhelmina Gottschalk), London-based physical theatre performer and director
• Peta Lindsay (born 1984), American anti-war activist
• Peta Murgatroyd (born 1986), New Zealand/Australian professional dancer
• Peta Murray, Australian writer
• Peta Rutter (1959-2010) New Zealand actress
• Peta Scholz (born 1976), Australian netball player
• Peta Seaton (born 1959), former Australian politician
• Peta Sergeant, Australian actress
• Peta Stephens (born 1978), Australian netball player
• Peta Taylor (1914-1989), English cricketer
• Peta Todd (born 1986), English glamour model
• Peta Toppano (born 1951), British-born Australian actress born Peita Toppano
• Peta Verco (born 1956), Australian cricketer
• Peta Wilson (born 1970), Australian actress and model

People for the Ethical Treatment of Animals (PETA ; stylized PeTA) is an American animal rights organization based in Norfolk, Virginia, and led by Ingrid Newkirk, its international president. A nonprofit corporation with 300 employees, it claims that it has 3 million members and supporters and is the largest animal rights group in the world. Its slogan is "animals are not ours to eat, wear, experiment on, use for entertainment, or abuse in any other way."

Peta is a decimal unit prefix in the metric system denoting multiplication by 10¹⁵ . It was adopted as an SI prefix in the International System of Units in 1975, and has the symbol P.