Smacking is harmful to children's mental health and should be banned, school psychologists say.
The Association of Educational Psychologists has tabled a motion to the TUC Conference calling for physical punishment to be outlawed.
Presently, although corporal punishment is banned in schools, parents can "smack" or physically chastise a child as long as it is deemed "reasonable".
Psychologists say there are many better ways of teaching right from wrong.
Member of the AEP national executive committee, John Drewicz, will tell the conference in Manchester: "Smacking is harmful to a child's mental health, it models aggressive behaviour and it says to them that it is OK to use violence."
He will add: "Sixty countries already have full bans, including Sweden, Ireland, Spain, Germany and Portugal, and it is time to make violence against children illegal in the UK in all settings, including the home."