According to one aspect of this invention, a device having two portions designated as a head portion and a tail portion is provided for maintaining a knot in a necktie. The tail portion of this device is longer than the head portion and is flexible. The head portion, in this aspect of the invention, may assume various configurations, and may be either rigid or flexible. Said device is insertable in the necktie knot before the latter is tightened; and when inserted in the knot, the tail portion of the device, which preferably is comprised of a flexible wire, is bent relatively to the head portion so that the device assumes the general outline of a completed necktie knot. When said device is placed within the necktie knot, the head portion is positioned between the downcoming wider end of the tie and the outer circumscribing fold of the knot, and the tail portion is positioned within the knot between the downcoming wider and narrower ends of the tie, and the end of the tail portion is oriented towards the head portion and is positioned within the inner folds of the necktie knot. Another embodiment of the invention disclosed resides in a device of the same general type as indicated above, but in which the head-portion is U-shaped. The flexible tail portion is attached to the center part of the head portion. The head portion is made from a material which is at least semi-rigid at ambient temperatures. When this device is positioned within the knot of a necktie, the tail portion is bent relative to the head portion in such a way that the device assumes the general outline of a completed necktie knot; one leg of the U-shaped head portion is disposed within the knot in front of the downcoming wider and narrower ends of the necktie but behind the outer circumscribing fold of the knot, while the other leg of the U-shaped head portion is positioned behind the downcoming narrower end of the necktie; and the tail portion is positioned within the knot between the downcoming narrower and wider ends of the necktie, with the end of said tail portion being oriented toward the head portion of the device.