Hundreds of manuscripts at Iona Abbey's historic library in the Inner Hebrides will be undergo restoration and buildings will be repaired with the funds.
The money is part of a two-year project funded by the Heritage Lottery Funding (HLF).
Chairperson of the Iona Cathedral Trust, Very Rev Dr Finlay Macdonald, said: "We are delighted this gem of a library can be made more accessible and our valuable heritage preserved thanks to this support from the Heritage Lottery Fund.
"Iona Cathedral attracts many visitors, but the library is hidden away... Many more people will be able to enjoy it thanks to this grant."
Located within the abbey's cloisters and described at one of Scotland's most historic libraries, the site contains Gaelic manuscripts and examples of Celtic art.
Lucy Casot, Head of HLF Scotland, said: "This is a great project that ...will transform the Iona Abbey Library Project for future visitors and encourage everyone to enjoy it's amazing heritage collections."
Material from the library will also be made available online via a new digital catalogue.
Founded in the sixth century, the early monastery of St Collumba in Iona produced notable writings including the Book of Kells, a Latin book containing the four Gospels.
Iona Abbey is thought to be one of Scotland's most popular historical attraction, while the island of Iona can attract 130,000 visitors every year.