The Kirby 23 is a recreational keelboat first built in 1985 with six boats completed, and it is now out of production. It was designed by Bruce Kirby as development of the Sonar. It is very similar to the Blazer 23.
The fibreglass hull has a raked stem, a reverse transom, an internally mounted spade-type rudder controlled by a tiller. It has a hull speed of .
It has a fractional sloop rig.