Allo may refer to:
allo-, a prefix used in linguistics to form terms for variant forms
'Allo, a form of Hello
Allo, a shortening of allosexual
Allopregnanolone, a neurosteroid sometimes abbreviated as "ALLO"
'Allo 'Allo!, a British television sitcom
Distance between:
Madrid to Allo173 Miles / 278 Kms Barcelona to Allo231 Miles / 372 Kms