Heinrich Blyssen (Latin Henricus Blissemius, Czech Jindřich Blyssem) (1526 – 24 April 1586) was a German Jesuit controversialist against the Hussites of Bohemia.
He entered the Society of Jesus, and Ignatius Loyola sent him with eleven other Jesuits to Bohemia to combat heresy there, and to sustain a public discussion with the disciples of Martin Luther and Hus.
Maintaining his controversy with the heretics of Bohemia, he published a collection of theses: De ciborum delectu atque jejunio (Prague 1559).
Attacked by Jacob Heerbrand on his doctrine concerning the Church, he published a defense of his thesis as Defensio assertionum theologicarum de verâ et sacrosanctâ Christi, quam habet in terris, Ecclesiâ militante (Ingolstadt, 1577).
His last and major work, De uno geminoque sacrae eucharistiae synaxeos salubriter percipiendae ritu ac usu, was published (Ingolstadt, 1585) when he was provincial of Austria.