A finger joint or comb joint is a woodworking joint made by cutting a set of complementary rectangular cuts in two pieces of wood, which are then glued. To visualize a finger joint simply interlock the fingers of your hands at a ninety degree angle; hence the name "finger joint." It is stronger than a butt or lap joint, and often contributes to the aesthetics of the piece.

The history of the finger joint is believed to have begun with wooden produce boxes or crates. Finger joints were originally cut by hand with saws and sharp chisels. In modern times they are easily and quickly made with a table saw or router and a jig or fixture, which can be shop-made or purchased from a specialty woodworking supply store. A finger joint jig typically consists of a moving fence with an indexing pin that is used to evenly space out the cuts. The fence is moved over a cutting blade making a cut that is then moved over the indexing pin so the next cut can be made.

While it is relatively easy to make using computer aided manufacture, a table saw or a wood router with a simple jig, some common problems include: