Monday, Monday est une chanson écrite en 1966 par John Phillips et enregistrée par The Mamas & the Papas pour leur album If You Can Believe Your Eyes and Ears (1966).
Ce fut le seul succès du groupe à être numéro un au Billboard Hot 100 aux États-Unis.
La chanson contient une fausse fin, quand une pause apparaît avant la coda de la chanson, puis le refrain de la chanson reprend.
Le 2 mars 1967, The Mamas & the Papas ont reçu un Grammy Award pour cette chanson.

Monday, Monday, so good to me
Monday mornin´, it was all I hoped it would be
Oh Monday mornin´, Monday mornin´ couldn´t guarantee
That Monday evenin´ you would still be here with me
Monday, Monday, can´t trust that day
Monday, Monday, sometimes it just turns out that way
Oh Monday mornin´ you gave me no warnin´ of what was to be
Oh Monday, Monday, how could you leave and not take me
Every other day, every other day
Every other day of the week is fine, yeah
But whenever Monday comes, but whenever Monday comes
A-you can find me cryin´ all of the time
Monday, Monday, so good to me
Monday mornin´, it was all I hoped it would be
But Monday mornin´, Monday mornin´ couldn´t guarantee
That Monday evenin´ you would still be here with me
Every other day, every other day
Every other day of the week is fine, yeah
But whenever Monday comes, but whenever Monday comes
A-you can find me cryin´ all of the time
Monday, Monday, can´t trust that day
Monday, Monday, it just turns out that way
Oh Monday, Monday, won´t go away
Monday, Monday, it´s here to stay
Oh Monday, Monday