As you can see below I have 11 polygons in one shapefile, so in the attribute table there are 11 features.

As they all have the same attribute, is it possible to merge them into one feature in QGIS?

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Have you already tested the 'Singleparts to multipart' tool in the processing toolbox? This should do the job.

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  • 2
    As far as I know, the number of the mulitpart features depends on the number of the unique attributes. Dec 18 '16 at 9:07
  • Yes you are right, I missed this option, my bad. Original misleading comment deleted.
    – Oto Kaláb
    Dec 18 '16 at 9:21
  • 1
    As of qgis 3.x "singlepart to multipart" is called "collect geometries".
    – sieberts
    Dec 17 '19 at 10:19

If you wnat keep any other features in the layer (besides theese in your example) single, you can select required features and perform Merge Selected Features in editing. This option is in Advanced Digitizing Toolbar, you can activate it in menu View --> Toolbars

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