Dennington is a village and civil parish in the English county of Suffolk. It is 2 miles (3.2 km) north of Framlingham and 15 miles (24 km) north-east of Ipswich in the east of the county. It lies along the A1120 road around 8 miles (13 km) west of the road's junction with the main A12 road in Yoxford.

At the 2011 census Dennington had a population of 578. The parish church is dedicated to St Mary. The village has a primary school, village hall and pub.

There is a limited public school bus service linking Dennington to Framlingham and Ipswich. The nearest railway station is at Darsham with an hourly service to either Ipswich or Lowestoft.

• Sir William Phelip, 6th Baron Bardolf (?-1441), Treasurer of the Household, Lord Chamberlain and hero of the Battle Of Agincourt buried in the south chapel of St Mary's Church Dennington.
• Sir Edmund Rous (by 1521 – 1572 or later), landowner, magistrate, Member of Parliament for Great Bedwyn, Dunwich, Dover, and Vice-Treasurer of Ireland.
• William Hughes (?-1600), rector of Dennington and later Bishop of St Asaph from 1573 till his death.
• Lionel Gatford (?-1665), royalist Church of England clergyman and rector of Dennington.
• William Miller (1769 – 1844); leading English publisher.
• Benjamin Philpot (1790-1889); clergyman and Archdeacon of Man from 1832 until 1839.
• Charles Hotham (1806-1855), Lieutenant-Governor and, later, Governor of Victoria, Australia.
• George Burr (1819-1857), first-class cricketer and Anglican priest.
• Peter Hartley (1909-1994); clergyman and Archdeacon of Suffolk from 1970 to 1975.
• General Sir Alfred Dudley Ward (1905-1991), British Army officer who saw distinguished active service during the Second World War and later became Governor of Gibraltar, is buried in the churchyard of St Mary's.
• Ed Sheeran (born 1991), singer–songwriter, resides in Dennington.