PHO or pho may refer to:

• Phở, a Vietnamese noodle soup
• 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

• Pho4, a basic helix-loop-helix transcription factor
• Phos, a genus of sea snails

This disambiguation page lists articles associated with the title PHO.
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