This is a list of Marilyn hills and mountains in the United Kingdom, Ireland and surrounding islands and sea stacks.

[5] Marilyn was the first of several subsequent British Isles classifications that rely solely on prominence, including the P600s,[6] the HuMPs, and the TuMPs.

[8][9] Although many of the islands' largest mountains, including Ben Nevis, Carrauntoohil, Scafell Pike and Snowdon, are Marilyns, many other large peaks such as Cairn Gorm, a number of Munros, and well-known hills such as Bowfell, the Langdale Pikes and Carnedd Dafydd, are not Marilyns because they do not have sufficient height relative to the surrounding terrain (i.e. they have taller "parents").

[b] As topological prominence is complex to measure, these tables are subject to revision over time, and should not be amended or updated unless the entire DoBIH data is re-downloaded.

Since the table was downloaded, the following changes have been made to the list of recognised Marilyns:[18] The DoBIH uses the following codes for the various classifications of mountains and hills in the British Isles, which many of the above peaks also fall into:[22][23]