T8 or T-8 may refer to the following:

• The International Telecommunications Union prefix for Palau
• A fluorescent lamp size
• The 8th thoracic vertebra
• The T8 spinal nerve
• Trikke8, a scooter-like vehicle
• An OS T1000 train class model, used on the Oslo Metro
• one of the Hong Kong Tropical Cyclone Warning Signals used by the Hong Kong Observatory
• Île-de-France tramway Line 8, one of the Tramways in Île-de-France

• Kreenholm
• Kreenholm Manufacturing Company
• Kreenholm Narva
• Kreepen Man
• Kreep (song)
• Kreepy-Krauly
• Kreeta Haapasalo
• Kree Woods
• Krefeld Airfield
• Krefeld Central Station
• Krefelder EV
• Krefeld EV
• Krefeld II – Wesel II
• Krefeld Zoo
• Krefftichthys
• Krefftichthys anderssoni
• Krefft's secret frog
• Kreftforeningen
• Kregar Ravine 10 Mass Grave
• Kregar Ravine 11 Mass Grave
• Kregar Ravine 12 Mass Grave
• Kregar Ravine 1 Mass Grave
• Kregar Ravine 2 Mass Grave
• Kregar Ravine 3 Mass Grave
• Kregar Ravine 4 Mass Grave