A shamrock is a young sprig of clover, used as a symbol of Christianity in Ireland. Saint Patrick, Ireland's patron saint, is said to have used it as a metaphor for the Christian Holy Trinity. The name shamrock comes from Irish , which is the diminutive of the Irish word for clover () and means simply "little clover" or "young clover".

Shamrock or Shamrocks may refer to:

• Shamrock, a three leaf clover (or sometimes other plants with similar leaves) that is a symbol of Ireland
• Oxalis regnellii, sometimes called "false shamrock"