Metadata for entire Landsat datasets are available to download. The files are updated daily. Note: The files are large and may take several minutes to download.
This webpage describes Landsat Level-1 metadata field updates that were made in May 2018.
For particular areas of interest or specific date ranges, the EarthExplorer Export Metadata functionality is useful. Details about this are on the the last two pages of the EarthExplorer Help Documentation.
Landsat 8 Operational Land Imager (OLI)/ Thermal Infrared Sensor (TIRS) (combined Pre- and On-WRS)
Landsat 7 Enhanced Thematic Mapper Plus (ETM+) (combined SLC-on/off)
Landsat 4-5 Thematic Mapper
Landsat 1-5 Multispectral Scanner (MSS)