It was once called Basmere. There has been a recorded settlement (under the name 'Badelesmere') as far back as the Domesday Book. Which also mentioned that in the time of King Edward the Confessor, the parish was worth sixty shillings. The manor was previously owned by Odo, Earl of Kent (as the Bishop of Bayeux). But after his trial (for fraud) in 1076. His assets were re-apportioned including Badlesmere. The abbot of St. Augustine's then claimed this manor.
During King Richard I reign (1157–1199), the manor was held by 'Guncelin de Badlesmere', who had accompanied the king during his Siege of Acon in Palestine. The manor passed through several generations of the Badlesmere family. Including, Gunselm de Badlesmere (Justice of Chester and Cheshire 1232 – 1301), 'Bartholomew de Badlesmere' (governor of Leeds Castle) after November 1317). He then obtained the king's licence to found a Priory on his lands. But nothing came to this licence.
The church, dedicated to St Leonard, is a grade II* listed Anglican church, described as 'interesting as a small, quite unremarkable church' which was not 'restored' in the Victorian era. Its interior is 13th century and 18th century. It has a complete set of Georgian box pews.
The quiet village green (known as Badlesmere Lees) lies off the main road between Faversham & Ashford.
The parish has been linked for many years with that of Leaveland, whose mediaeval church, which is very different from Badlesmere. It has a crown-post roof and a 16th-century monument to a local family survived the Victorian restoration.