Thelma Andrews scooped the honour during the regional finals of the 1999 Teacher Awards.
Mrs Andrews, who has been teaching at St Mary's School in Stoke Newington for ten years, was nominated for the award by staff, pupils and parents.
Ann Mosol, headteacher of St Mary's, said: 'Our Mrs Andrews is extremely precious to all of our school community and we are very proud of her.
Elizabeth Reid, director of education for Hackney LBC, expressed her delight at the news of Mrs Andrew's achievement.
She said: 'This is such a magnificent award for Mrs Andrews and a tremendous personal triumph.
'It reflects the hard work and determination of many teachers in Hackney and I am thrilled that she has been recognised in this way.'
Mrs Andrews began her teaching career in 1959 in Gambia and came to St Mary's in 1989 to mainly teach infant classes.
On picking up her award, Mrs Andrews said: *I am happy for Hackney where I live and work and for St Mary*s Church where I worship.
'The support of the governors, staff, parents and children made this award possible and it is with great pride that I receive it.'
Mrs Andrews, who partly puts her success down to being able to really listen to her pupils, is set to retire in July.