This is a list of acts of the Parliament of the United Kingdom passed in the calendar year 1879 and the session of the 42nd and 43rd years of the reign of Queen Victoria. It was the sixth session of the twenty-first Parliament of the United Kingdom. Sources published during the regnal year 42 Vict refer to this session as 42 Vict, because, at that time, it was not known when the session would end.