Mattheus Pinna da Encarnaçao (23 August 1687 – 18 December 1764) was a Brazilian Benedictine writer and theologian.
On 3 March 1703, he became a Benedictine at the Abbey of Nossa Senhora do Montserrate at Rio de Janeiro, where he also studied the humanities and philosophy under José da Natividade [Wikidata].
He escaped to Portugal, became very influential at Court and was restored to his monastery by Cardinal João da Motta e Silva [Wikidata] in 1729.
In 1732 he was elected provincial abbot, in which capacity he visited the distant monasteries of Brazil, despite the difficulty of travel.
He was again elected provincial abbot in 1752, but this time he declined, preferring to spend his old age in prayer and retirement.