Yaldwyn's triplefin, Notoclinops yaldwyni, is a fish of the genus Notoclinops, found around the North Island of New Zealand from low water to depths of about 5 metres, most common in reef areas of broken rock, but nowhere common. Its length is between 4 and 8 centimetres. It is a pale yellow-brown with a faint orange tinge to the head, and two or three rows of small black dots on the flanks.