Thalassophobia is an intense and persistent fear of the sea. Thalassophobia is a clinical phobia generally classified under specific phobias, fear of a single specific panic trigger. Symptoms for thalassophobia are the same as for most specific phobias.

Although it is a clinical phobia, it often accompanies other anxiety disorders. In some cases anxiolytic medications may be prescribed or Cognitive behavioural Therapy (CBT) may be indicated.