Ruth McKay (born 2 August 1986) is a New Zealand rugby union player.

She started in the World Cup final against England where the Black Ferns claimed their fourth title.

[13][14] In 2012, she was selected for the Black Ferns squad that toured England for a three-test series in November.

[21] She played in the Black Ferns side that competed in an international women's rugby series in Rotorua in June 2014.

[23][24] McKay made the selection for her final World Cup appearance at the 2014 tournament in France.

[25] She then featured in the pool game where Ireland stunned the Black Ferns with their first defeat in a World Cup since their 1991 semi-final loss to the United States.