Jacoby 2NT is a bridge convention in which a bid of 2 Notrump, over partner's 1 of a major opening, is used to show typically a balanced hand of game-forcing strength, with at least four cards in opener's suit. Opener's rebids show strength and shape. It is usually used in conjunction with splinter bids to show similar unbalanced hands.

The convention is named for its inventor, Oswald Jacoby.