The Litany of the Most Holy Trinity (1)

Blessed be the holy Trinity and undivided Unity;
we will give glory to him, because he has shown his mercy to us.

O Lord our Lord, how wonderful is your name in all the earth!
O the depth of the riches of the wisdom and of the knowledge of God!

Lord, have mercy.
Christ, have mercy.
Lord, have mercy. 

Blessed Trinity, hear us.
Adorable Unity, graciously hear us.

God the Father of Heaven, have mercy on us.
God the Son, Redeemer of the world, have mercy on us.
God the Holy Ghost, have mercy on us. 

Holy Trinity, One God, have mercy on us. 

Father, from whom are all things,
Son, through whom are all things,
Holy Spirit, in whom are all things, have mercy on us. 

Holy and undivided Trinity, have mercy on us. 

Eternal Father,
only Son of the Father,
Spirit who proceeds from the Father and the Son, have mercy on us. 

Co-eternal majesty of three divine persons, have mercy on us. 

Father, the Creator,
Son, the Redeemer,
Holy Spirit, the Comforter, have mercy on us. 

Holy, holy, holy, Lord God of hosts,
who is, who was, and who is to come,
God most high, who inhabits eternity,
to whom alone are due all honor and glory,
who alone does great wonders,
power infinite,
wisdom incomprehensible,
love unspeakable, have mercy on us. 

Be  merciful, spare us, O Holy Trinity.
Be  merciful, graciously hear us, O Holy Trinity.

From all evil, deliver us, O Holy Trinity.
From all sin, deliver us, O Holy Trinity. 

From all pride,
from all love of riches,
from all uncleanness,
from all laziness,
from all misdirected love,
from all envy and malice,
from all anger and impatience,
from every thought, word, and deed contrary to your holy law,
from your everlasting condemnation, deliver us, O Holy Trinity. 

Through your almighty power,
through your abundant loving kindness,
through the exceeding treasure of your goodness and love,
through the depths of your wisdom and knowledge,
through all your unspeakable perfections, deliver us, O Holy Trinity. 

We sinners pray, hear us.

That we may always serve you alone,
that we may worship you in spirit and in truth,
that we may love you with all our heart, with all our soul, and with all our strength,
we pray, hear us.

That, for your sake, we may love our neighbors as ourselves,
that we may faithfully keep your holy commandments,
that we may never defile our bodies and souls with sin,
that we may go from grace to grace, and from virtue to virtue,
that we may finally enjoy the sight of you in glory,
that you would hear us,
we pray, hear us.

O blessed Trinity, deliver us.
O blessed Trinity, save us.
O blessed Trinity, have mercy on us.

Lord, have mercy,
Christ, have mercy.
Lord, have mercy.

Our Father…

Blessed are you, O Lord, in the firmament of heaven,
And worthy to be praised, and glorious, and highly exalted forever.

Let us pray.
Almighty and everlasting God, you have granted your servants in the confession of the true faith, to acknowledge the glory of an eternal Trinity, and in the power of your majesty to adore a Unity. Strengthen our faith and defend us from all adversity; through Jesus Christ Our Lord. Amen.

Source: Modified from http://catholictradition.org/Litanies/litanies1a.htm