What is All Saints Day?

All Saints Day is when the Church celebrates every saint, known and unknown, at one time. The eve of this fesitval is known as All Hallows Eve, or Halloween. All Saints Day is November 1. 

A Catholic Prayer in Praise of the Saints.

How shining and splendid are your gifts, O Lord
which you give us for our eternal well-being
Your glory shines radiantly in your saints, O God
In the honour and noble victory of the martyrs.
The white-robed company follow you,
bright with their abundant faith;
They scorned the wicked words of those with this world's power.
For you they sustained fierce beatings, chains, and torments,
they were drained by cruel punishments.
They bore their holy witness to you
who were grounded deep within their hearts;
they were sustained by patience and constancy.
Endowed with your everlasting grace,
may we rejoice forever
with the martyrs in our bright fatherland.
O Christ, in your goodness,
grant to us the gracious heavenly realms of eternal life.
Unknown author, 10th century

Prayer to the Saints and Angels Before Mass

Angels, Archangels,
Thrones, Dominions,
Principalities, Powers,
heavenly Virtues,
Cherubim and Seraphim;
all Saints of God,
holy men and women,
and especially my patrons:
intercede for me
that I may be worthy
to offer this Sacrifice to almighty God,
to the praise and glory of His name,
for my own welfare
and also that of all His holy Church. Amen.
From the Roman Missal

Catholic Liturgy of the Hours All-Saints Prayer

Father, All-Powerful and ever-living God,
today we rejoice in the holy men and women
of every time and place.
May their prayers bring us your forgiveness and love
We ask this in the name of Jesus Christ our Lord. Amen.

A Prayer for Saintly Grace

Almighty and Everlasting God,
who dost enkindle the flame of Thy love in the hearts of the saints,
grant unto us the same faith and power of love;
that, as we rejoice in their triumphs
we may profit by their examples, through Jesus Christ our Lord.
Gothic Missal

Litany of the Saints

Lord, have mercy on us. (Lord have mercy on us)
Christ, have mercy on us. (Christ have mercy on us)
Lord, have mercy on us. (Lord, have mercy on us)
Christ, hear us. (Christ, hear us)
Christ, graciously hear us. (Christ, 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 Spirit, (have mercy on us.)
Holy Trinity, one God, (have mercy on us)
Holy Mary, Holy Mother of God, (pray for us*)
Holy Virgin of virgins,
St. Michael,
St. Gabriel,
St. Raphael,
All you holy Angels and Archangels,
All you holy orders of blessed Spirits,
St. John the Baptist,
St. Joseph,
All you holy Patriarchs and Prophets,
St. Peter,
St. Paul,
St. Andrew,
St. James,
St. John,
St. Thomas,
St. James,
St. Philip,
St. Bartholomew,
St. Matthew,
St. Simon,
St. Thaddeus,
St. Matthias,
St. Barnabas,
St. Luke,
St. Mark,
All you holy Apostles and Evangelists,
All you holy Disciples of the Lord,
All you holy Innocents,
St. Stephen,
St. Lawrence,
St. Vincent,
SS. Fabian and Sebastian,
SS. John and Paul,
SS. Cosmas and Damian,
SS. Gervase and Protase,
All you holy Martyrs,
St. Sylvester,
St. Gregory,
St. Ambrose,
St. Augustine,
St. Jerome,
St. Martin,
St. Nicholas,
All you holy Bishops and Confessors,
All you holy Doctors,
St. Anthony,
St. Benedict,
St. Bernard,
St. Dominic,
St. Francis,
All you holy Priests and Levites,
All you holy Monks and Hermits,
St. Mary Magdalen,
St. Agatha,
St. Lucy,
St. Agnes,
St. Cecilia,
St. Catherine,
St. Anastasia,
All you holy Virgins and Widows,
All you holy Saints of God, (make intercession for us.)
Be merciful, (spare us, O Lord.)
Be merciful, (graciously hear us, O Lord.)
From all evil, O Lord (deliver us*)
From all sin,
From Your wrath,
From sudden and unlooked for death,
From the snares of the devil,
From anger, and hatred, and every evil will,
From the spirit of fornication,
From lightning and tempest,
From the scourge of earthquakes,
From plague, famine and war,
From everlasting death,
Through the mystery of Your holy Incarnation,
Through Your Coming,
Through Your Birth,
Through Your Baptism and holy Fasting,
Through Your Cross and Passion,
Through Your Death and Burial,
Through Your holy Resurrection,
Through Your admirable Ascension,
Through the coming of the Holy Spirit, the Paraclete.
In the day of judgment.
We sinners, (We implore you to hear us*)
That You would spare us,
That You would pardon us,
That You would bring us to true penance,
That You would vouchsafe to govern and preserve Your holy Church,
That You would vouchsafe to preserve our Apostolic Prelate,
and all orders of the Church in holy religion,
That You would vouchsafe to humble the enemies of holy Church,
That You would vouchsafe to give peace and true concord to Christian kings and princes,
That You would vouchsafe to grant peace and unity to the whole Christian world,
That You would call back to the unity of the Church all who have
strayed from her fold, and to guide all unbelievers into the light of the Gospel,
That You would vouchsafe to confirm and preserve us in Your holy service,
That You would lift up our minds to heavenly desires,
That You would render eternal blessings to all our benefactors,
That You would deliver our souls, and the souls of our brethren,
relations, and benefactors, from eternal damnation,
That You would vouchsafe to give and preserve the fruits of the earth,
That You would vouchsafe to grant eternal rest to all the faithful departed,
That You would vouchsafe graciously to hear us,
Son of God,
Lamb of God, who takes away the sins of the world, (spare us, O Lord.)
Lamb of God, who takes away the sins of the world, (graciously hear us, O Lord.)
Lamb of God, who takes away the sins of the world, (have mercy on us.)
Christ, (hear us)
Christ, (graciously hear us)
Lord, have mercy, (Lord, have mercy)
Christ, have mercy, (Christ, have mercy)
Lord, have mercy, (Lord, have mercy)
Finally say the Our Father inaudibly.
NB: *- say this response until a new one appears in parenthesis.