Vexilla regis (The royal banner), WAB 51, is the final motet written by the Austrian composer Anton Bruckner.

In his letter of 7 March 1892 to Bernhard Deubler, Bruckner wrote that he had composed this work "according to a pure impulse of the heart".

[3] The work was first performed on Good Friday, 15 April 1892, and was published in the same year by Josef Weinberger, ViennaIn the Album der Wiener Meister.

In his edition, Wöss has, in accordance with the choral reforms under Pius X, used the old text of the Vexilla Regis and took into account the accompaniment of the penultimate and last strophes.

[4] In the Nowak-Bauernfeind new edition (Band XXI/29 of the Gesamtausgabe) the motet was re-issued with the seven strophes of Bruckner's original manuscript, with a final four-bar Amen.