F33 may refer to :

• HMS Somali (F33), a 1937 British Royal Navy Tribal-class destroyer
• Recurrent depressive disorder ICD-10 code
• Hirth F-33, an aircraft engine

• Haselhorst
• Haselrig's lobsters
• Haselton pa
• Haselund
• Haselwort
• Hasely Joachim Crawford
• Haselünne
• Hasenbergl (Munich U-Bahn)
• Hasenbuck (Nuremberg U-Bahn)
• Hasenburg
• Hasenclever
• Hasenfeffer
• Hasenkrug
• Hasenmoor
• Hasenpoth
• Hasensee
• Haseo
• Haseo (.hack)
• Ha Seok-ju
• Haserich
• Hase (river)
• Hase Seishū
• Hase Station
• Hase Station (Hyogo)
• Hase Station (Hyōgo)