The Welsh Language Use Survey 2019 to 2020 was carried out as part of the National Survey for Wales, in similar fashion to the Welsh Language Use Survey 2013 to 2015.
Cafodd Arolwg Defnydd Iaith 2019-20 ei gynnal fel rhan o Arolwg Cenedlaethol Cymru, yn yr un modd ag Arolwg Defnydd Iaith 2013-15.