People

• Pao Ching-yen (also spelled Bao Jingyan), a Chinese, anarchist
  Anarchism
  Anarchism is generally defined as the political philosophy which holds the state to be undesirable, unnecessary, and harmful, or alternatively as opposing authority in the conduct of human relations...
  
   philosopher who lived in the early fourth century C.E.
• Yih-Ho Michael Pao
  Yih-Ho Michael Pao
  Yih-Ho Michael Pao is an American entrepreneur and hydro-engineer. He was an early pioneer in developing large-scale wind turbines. In 2000, Dr. Pao was elected a member of the National Academy of Engineering for his research, development, and commercialization of ultrahigh-pressure waterjet...
  
  , an American entrepreneur and hydro-engineer

Fictional

• Pao-chan, a fictional character from the Japanese magical girl anime television series, Ojamajo Doremi.

Places

• Pao River, the name of several rivers
• Pao, Trakan Phuet Phon - Ubon Ratchathani Province, Thailand

Things

• Pa, the Cantonese word for baozi
  Baozi
  A bāozi or simply known as bao, bau, humbow, nunu, bausak, pow or pau is a type of steamed, filled bun or bread-like item in various Chinese cuisines, as there is much variation as to the fillings and the preparations...
  
  

• Pao is the name of Indonesian mango^Questioned
• Pao (袍), an element of Han Chinese clothing
  Han Chinese clothing
  Hanfu or Han Chinese Clothing, also sometimes known as Hanzhuang , Huafu , and sometimes referred in English sources simply as Silk Robe or Chinese Silk Robe refers to the historical dress of the Han Chinese people, which was worn for millennia before the conquest by the Manchus and the...
  
  
• Pao (unit), an obsolete unit of mass and (especially) dry measure in South Asia
• Panathinaikos Athlikos Omilos (PAO), the Greek multisport club
• Prince Alfreds Own
  Cape Field Artillery
  The Cape Field Artillery is an artillery regiment of the South African Army. As a reserve unit, it has a status roughly equivalent to that of a British Territorial Army or United States Army National Guard unit...
  
   Cape Volunteer Artillery, (PAO) or (PAOCVA)
• A fairy chess piece
  Fairy chess piece
  A fairy chess piece or unorthodox chess piece is a piece analogous to a chess piece. It is not used in conventional chess, but is used in certain chess variants and some chess problems...
  
  
• Nissan Pao
  Nissan Pao
  The Nissan Pao, first announced at the Tokyo Motor Show in October 1987, is a retro-styled automobile from Nissan Motors. It was available as a three-door hatchback with or without a textile sun roof , the canvas top being the most collectible. The Pao was one of three fashionable spinoffs of the...
  
  , an automobile
• The Languages of Pao
  The Languages of Pao
  The Languages of Pao is a science fiction novel by Jack Vance, first published in 1958, in which the Sapir–Whorf hypothesis is a central theme. A shorter version was published in Satellite Science Fiction in late 1957. After the Avalon Books hardcover appeared the next year, it was reprinted in...
  
  , a science fiction novel by Jack Vance
• Barangay Pao
  Barangay Pao
  Barangay Pao is a partially urban barangay of Manaoag. As of 2007 census it has 3, 488 population with 852 households. It has a land area of 183.40 hectares. Its week-long celebration of annual Barangay Fiesta in honor of St. Catherine of Siena has been regarded as municipal class which draws...
  
  , a progressive barangay of Manaoag, Pangasinan.

All capital letters

• PAO, the ICAO code for Polynesian Airlines
  Polynesian Airlines
  Polynesian Airlines is the national airline of Samoa and has its headquarters in the Samoa National Provident Fund Building in the capital, Apia. It formerly flew all over the Pacific but with the establishment of Polynesian Blue by the government and Virgin Blue , Polynesian Airlines has...
  
  
• PAO, the IATA airport code for Palo Alto Airport of Santa Clara County
  Palo Alto Airport of Santa Clara County
  Palo Alto Airport of Santa Clara County is a general aviation airport in the city of Palo Alto in Santa Clara County, California, USA, near the south end of San Francisco Bay on the western shore.- Facilities :...
  
  
• acronym for Phased-array optics
• acronym for Public Affairs Office
  Public affairs (military)
  Public Affairs is a term for the formal offices of the branches of the United States Department of Defense whose purpose is to deal with the media and community issues. The term is also used for numerous media relations offices that are created by the U.S. military for more specific limited purposes...
  
  
• acronym for Pierre Auger Observatory
  Pierre Auger Observatory
  The Pierre Auger Observatory is an international cosmic ray observatory designed to detect ultra-high-energy cosmic rays: single sub-atomic particles with energies beyond 1020 eV...
  
  
• shorthand for polyalphaolefin, a type of linear alpha olefin
• shorthand for the period-after-opening symbol
  Period-after-opening symbol
  The period-after-opening symbol or PAO symbol is a graphic symbol that identifies the useful lifetime of a cosmetics product after its package has been opened for the first time...
  
  found on cosmetics products