Lilias is a feminine given name, and may refer to:
- Lilias Craven, fictional character in the children's novel The Secret Garden (1911)
- Lilias Folan (20th century), television show host
- Lilias Mary Gower (1877-1959), Welsh croquet player
- Lilias Massey, Chatelaine of Rideau Hall
- Lilias Torrance Newton (1896-1980), Canadian painter
- Lilias Trotter (1853-1928), Christian missionary in Algeria
- Lillias Hamilton (1858-1925), British doctor
- Lillias Rumsey Sanford (1850-1940), founder of Rumsey Hall School
- Lillias Margaret Skene (1867-1957), Australian feminist
- Lillias White, American actress
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