Secundian or Secundianus may refer to:
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Secundian, Marcellian and Verian (died 250), Christian saints martyred in 250 AD
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Donatus, Romulus, Secundian, and 86 Companions (died 304), group of Christians who were martyred c. 304 AD
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Secundianus of Singidunum Secundianus of Singidunum () was bishop of Singidunum (in the Roman province of Dacia, modern Belgrade). Little is known of his life; except that he was condemned for heresy at the Council of Aquileia (in the northeast of modern Italy) in 381.
Pa ...
, an Arian bishop of Singidunum deposed at the Council of Aquileia, 381
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