Annuity may refer to:

• Annuity (finance theory), (Payout phase) any recurring periodic series of payments.
• Annuity (finance theory) (Accumulation phase) a tax deferred savings vehicle.
• Annuity (financial contracts), an insurance-like contract providing Monthly, Quarterly, Semi-Annual or Annual payments
• Annuity (US financial products)
• Annuity (European financial arrangements)
• Life annuity (also single payment annuity), a financial contract providing payments for a person's lifetime
• Annuity, a maintenance fee (patent) in patent law.

Annuity is concern with Insurance Pension Plan.

An annuity that has no definite end is called a perpetuity.