PHO or pho may refer to:

• Phở, a Vietnamese noodle soup

• Pho (restaurant), UK chain

• Primary health organisation, New Zealand

• Public health observatory, UK

• Potentially hazardous object, an asteroid or comet that could potentially collide with Earth

• Pho regulon, a bacterial phosphate regulatory mechanism

See also

• Pho4, a basic helix-loop-helix transcription factor

• Phos, a genus of sea snails