Beths Grammar School, commonly known as Beths, is an all-boys grammar school with academy status in Bexley in South East London.

Pupils are admitted from the age of 11, with girls joining the sixth form in Year 12.

Specialising in technical subjects such as Mechanical Engineering, Building Construction and Academic.

The buildings (opposite the Seamans Home) were shared with the then Erith Grammar School.

In 2006, the school gained an additional specialism as a Modern Foreign Languages College.