Hideous may refer to:

• Ugliness
• Hideous (liqueur)
• Hideous!, a 1997 film directed by Charles Band
• Hideous Records, a British record label established by the band Reuben

• Poplicani
• Pop Life (Bananarama album)
• Pop Life (Breathe album)
• Pop Life (David Guetta album)
• POPLINE
• Popliteal artery entrapment syndrome
• Popliteal bursitis
• Popliteal cyst
• Popliteal fossa
• Popliteal glands
• Popliteal height
• Popliteal line
• Popliteal lymph glands
• Popliteal lymph nodes
• Popliteal muscle
• Popliteal nerve
• Popliteal pterygium syndrome
• Popliteal tendon
• Popliteal web syndrome
• Popliteus muscle
• POPLmark
• POPLMARK
• POPLmark challenge
• Poplock
• Pop-lock