Burnham-on-Sea is a town in Somerset, England, at the mouth of the River Parrett and Bridgwater Bay. Burnham remained a small village until the late 18th century, but is now a popular seaside resort as well as the home of the shortest pier in Great Britain. It forms part of the parish of Burnham-on-Sea and Highbridge. According to the 2001 census the population of the parish was 18,401.

Burnham-on-Sea is notable for its beach and mudflats, the danger they pose to individuals and shipping, and the efforts locals have gone to defend their town and to prevent loss of life. The Bristol Channel has the second highest tidal range in the world. The extensive mud flats at Burnham are characteristic of Bridgwater Bay and the rest of the Bristol Channel where the tide can recede for over 1.5 miles (2.4 km). Over the years a string of people have died when they became trapped in mud and were overcome by the rapidly rising waters. One of the earliest recorded historical incidents to affect the town was the Bristol Channel floods of 1607. Today the town is defended from flooding by a large curved concrete wall that runs along the Esplanade.

Burnham-on-Sea railway station was the terminus of the Burnham branch of the Somerset and Dorset Joint Railway. The former GWR station is now known as Highbridge and Burnham.

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