An aircraft landing gear door assembly has a plurality of doors. The doors include a first door (1) mounted for rotational movement between closed and open positions about a first generally longitudinal axis (11) and a transverse door (3) mounted for rotational movement between closed and open positions about a generally horizontal axis (13) that is transverse to the longitudinal axis (11). The provision of the transverse door (3) can allow the length of the first door (1) to be reduced from that which would otherwise be required to allow passage of the landing gear.