Sirca may refer to:

• SIRCA, an acronym with multiple uses

• Sirča, a village situated in Kraljevo municipality in Serbia.
• Majda Širca, a Slovenian art historian, journalist, and politician.

• Fleetwood Weekly News
• Fleetwood Wyre Dock railway station
• FLEG
• Flegamina
• Fleggburgh
• Fleggburgh, Norfolk
• Flegg High Ormiston Academy
• Flegg high school
• Flegm
• Flegmatic
• Flehe Bridge
• Flehemening
• Flehmen pose
• Flehmen position
• Flehming
• Flehming reaction
• Flehming response
• F Leighton
• Fleimstal
• Flein
• Fleinhausen
• Fleinsendin
• Fleischer
• Fleischer Bros.
• Fleischer Brothers