Po2, pO₂, PO₂, or PO2 may refer to:

• A military rank:
  • Petty Officer 2nd Class in the Canadian military
  • Petty Officer Second Class in the United States military
• Polikarpov Po-2 or U-2, a Soviet aeroplane
• Partial pressure of Oxygen, that is, amount of oxygen in the blood (normally referred to as Dissolved Oxygen)
• PO₂: Phosphorus dioxide, a gaseous free radical that plays a role in the chemiluminescence of phosphorus and phosphine.
• Po²⁻: Polonide anion
• a power of two in mathematics

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