Folcmar (died 10 December 990), also named Poppo, was a bishop of Utrecht from 976 to 990.

Folcmar was the son of the Saxon count Adalbero and an uncle of bishop Bernward of Hildesheim, a fervent builder who was responsible for the famous bronze doors and the Christussäule (Bernward Column). Folcmar was a member of the Chapter in Hildesheim, and in 975 he became Chancellor of Otto II, Holy Roman Emperor, who afterwards appointed him to the bishopric of Utrecht.
When Otto II's cousin, Henry II, Duke of Bavaria, revolted in a bid to seize the throne, he was defeated, stripped of all his possessions and placed in the custody of bishop Folcmar. After Otto II's death, Henry was released, but he soon made another attempt at the throne against the infant Otto III, Holy Roman Emperor. This kept Folcmar involved in the succession issue. Folcmar was buried in the Dom Church of Utrecht.

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This info was partially taken from: 

990 deaths
Bishops of Utrecht
10th-century bishops in Lotharingia
Burials at St. Martin's Cathedral, Utrecht
Year of birth missing