Lorcan (Irish: Lorcán) is male given name, meaning 'little fierce one', and may refer to:

• Lorcan Allen (born 1940), Irish farmer and former Fianna Fáil Teachta Dála TD
• Lorcan Cranitch (born 1959), Irish actor
• Lorcan Dempsey (born 1958), the Vice President and Chief Strategist of the Online Computer Library Center (OCLC)
• Lorcán mac Cellaig (flourished 848), King of Leinster of the Uí Muiredaig sept of the Uí Dúnlainge branch of the Laigin
• Lorcán mac Fáelán, the seventh of ten Kings of Leinster to be inaugurated and based on Lyons Hill, Ardclough, County Kildare
• Lorcán Ó Muireadais (1883–1941), Irish Roman Catholic priest, Irish language educator and nationalist activist
• Lorcan O'Herlihy (born 1959), architect
• Lorcán Ua Tuathail (1128–1180), Saint Laurence O'Toole, canonized in 1225 by Pope Honorius III