Brettenham is a village and civil parish in the Babergh district of Suffolk, England. In 2005 it had a population of 270, increasing to 353 at the 2011 Census, and reduced to 320 in the 2021 census. Almost the entire built-up area is defined as a conservation area, and the parish also contains some ancient woodland at Ram's Wood. The village is home to independent prep school, Old Buckenham Hall.