Nicasius was a Roman cognomen, whose variants include Nicasio, Nicaise, and Necaise. It can refer to:

Saints

• Nicasius of Rheims (5th century)
• Nicasius of Dijon (4th century)
• Nicasius, Quirinus, Scubiculus, and Pientia (3rd century), martyrs
• Nicasius of Sicily (Nicasio Burgio, Nicasius Martyr, Nicasius de Burgio) (died 1187), martyred Knight Hospitaller

Other

• Nicasio, California, a census designated place in Marin County
• Nicasius le Febure
• Nycasius de Clibano ( fl. 1457–1497)
• Nicasius Russell (died 1646), goldsmith to Anne of Denmark
• Nicasio Silverio (born 1930), Cuban swimmer
• Nicasius, first bishop of Rouen ( c. 250)
• Alberto Nicasio (1902–1980), Argentinian artist
• Juan Nicasio (born 1986), Dominican baseball pitcher
• Nicasius de Vries (born 1995), Dutch racing driver
• Viviane Nicaise (born 1952), Belgian cartoonist and colorist

This disambiguation page lists articles associated with the title Nicasius.
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