John Arundell, of Lanherne, St. Mawgan-in-Pyder, Cornwall, was an English politician. He was a noted recusant, and a close associate of the Catholic martyr St. Cuthbert Mayne.

St Mawgan or St Mawgan in Pydar is a village and civil parish in Cornwall, England, United Kingdom. The population of this parish at the 2011 census was 1,307. The village is situated four miles northeast of Newquay, and the parish also includes the hamlet of Mawgan Porth. The surviving manor house known as Lanherne House is an early 16th-century grade I listed building. The nearby Royal Air Force station, RAF St Mawgan, takes its name from the village and is next to Newquay Cornwall Airport. The River Menalhyl runs through St Mawgan village and the valley is known as The Vale of Lanherne. It was the subject of a poem by poet Henry Sewell Stokes.