May publicly stated her support for the UK remaining in the EU during the 2016 referendum campaign, but did not campaign extensively in the referendum and criticised aspects of the EU in a speech.
May mendukung bertahannya Britania Raya di Uni Eropa pada referendum tahun 2016, tetapi tidak terlibat kampanye dan sempat mengkritik sejumlah aspek terkait Uni Eropa.