The Landlord and Tenant Law Amendment Act, Ireland, 1860[1] (23 & 24 Vict.

The Act was named after its promoter Rickard Deasy, the Attorney-General for Ireland in the Liberal Party government of Lord Palmerston.

The Act made contract law the basis for tenancies and abolished any feudal rents paid by services to a landlord, or by payments in kind.

Section 4 remains the most important part of Deasy's act still in force.

It provides that all leases of over twelve months must be evidenced in writing in order to be enforced.