Ásta Ragnheiður Jóhannesdóttir (Icelandic: ['austa 'rakn?heið?r 'jou?han?s?tou?t?r?]; born 16 October 1949) is an Icelandic politician and was Speaker of Alþingi, Iceland's parliament.
She was Iceland's Minister of Social Affairs and Social Security from 1 February 2009 – 14 May 2009.
She served as speaker of the Althing from 2009 to 2013.