Trinny & Susannah Undress... is a British reality makeover and fashion-themed television programme on ITV featuring fashion advisors Trinny Woodall and Susannah Constantine.

The series sees Trinny Woodall and Susannah Constantine going to different households where couples experience difficulties in their relationship, and exploring how clothing and style impact marriage and relationships. Woodall and Constantine give advice and improve the appearance and style of the couples in an effort to rekindle the marriages and relationships that have become troubled.

The series of Trinny & Susannah Undress... was first broadcast on 3 October 2006 and consisted of six episodes. Woodall and Constantine had defected from BBC One, where they hosted the show What Not to Wear, to ITV in Autumn 2006 in order to host their show. The first series of Trinny & Susannah Undress... debuted with strong viewing figures of 4.27 million viewers, and reached a series high of 4.48 million on 24 October. Also in 2006, Trinny and Susannah became the faces of Littlewoods Direct. During their sponsorship of Trinny & Susannah Undress, orders rose by thirty per cent.

The second series of Trinny & Susannah Undress... began on Tuesday 5 June 2007 and consisted of three episodes. The ratings appeared to decrease since the first series, with the show attracting 2.92 million viewers in the first episode. The viewing figures did rise to 3.1 million on the second episode. The format of the first two series exposed Woodall and Constantine to particular criticism that questioned whether they were qualified to deal with some of the serious issues raised. Trinny & Susannah Undress... has also been shown on various other television stations including The Lifestyle Channel in Australia. Woodall and Constantine then hosted Trinny & Susannah Undress the Nation in November 2007.

 Australia on The Lifestyle Channel

 Belgium on Vitaya

 Canada on BBC Canada

 Ireland on TV3