Flannery is a bridge convention using an opening 2 Diamond bid to show a hand of minimal opening bid strength (11-15 high card points) with exactly four spades and five (or sometimes six) hearts. Responder can inquire further about opener's hand by relaying with 2 Notrump.

This convention is particularly useful when playing a forcing notrump, to prevent opener from having to respond in a nonsuit after 1 Heart - 1 Notrump when not strong enough to reverse.