Psalm 117 is the 117th psalm of the Book of Psalms, beginning in English in the King James Version: "O praise the LORD, all ye nations: praise him, all ye people." In Latin, it is known as Laudate Dominum. Consisting of only two verses, Psalm 117 is the shortest psalm and also the shortest chapter in the whole Bible. It is joined with Psalm 118 in the manuscripts of the Hebraist scholars Benjamin Kennicott and Giovanni Bernardo De Rossi.

In the slightly different numbering system in the Greek Septuagint and the Latin Vulgate version of the Bible, this psalm is Psalm 116.

Verse 1 is quoted in Romans 15:11.

In Psalm 117, the gentiles are invited to join in praise of God. Christians view this as a fulfillment of God's promise of mercy to the gentiles, pointing to God's promise that all nations would be blessed in the seed of Abraham, who they believe is Christ, as described in the Letter to the Galatians:

Now to Abraham and his seed were the promises made. He saith not, And to seeds, as of many; but as of one, And to thy seed, which is Christ.

— Galatians 3:16, King James Version

In the Catholic Church, the Rule of Saint Benedict assigns this psalm (116 in the Vulgate) to the Office of Vespers on Monday. Saint Benedict of Nursia generally used four psalms in vespers, but because of the shortness of this psalm, he added a fifth when it was used. It is currently used in the Liturgy of the Hours on Saturday of Weeks I and III. The psalm may be sung after Benediction of the Blessed Sacrament, a ritual performed in Catholic and some Anglican churches.

In the Orthodox Church, this psalm is read as part of the 16^th kathisma, to be read ordinarily during Saturday Matins.