Buldus was an 11th-century Hungarian bishop and martyr who died in 1046. While his specific diocese remains unknown, historians suggest he may have served in Eger, Veszprém, Bihar, or Gyulafehérvár. He was killed on Gellért Hill in Buda during an uprising while traveling with other bishops, including Gerhard of Csanád, to meet Prince Andrew of Hungary. His death occurred during a violent confrontation where he was struck by stones and spears.