The word(s) "monotheism" appears 283 time(s) in 267 verse(s) in Quran in Mohsin Khan translation.

(51) Allah calls to the Home of Peace (i.e. Paradise, by accepting Allah's religion of Islamic monotheism and by doing righteous good deeds and abstaining from polytheism and evil deeds) and guides whom He wills to the Straight Path.

(52) Those who believed (in the Oneness of Allah - Islamic monotheism), and used to fear Allah much (by abstaining from evil deeds and sins and by doing righteous deeds).

(53) "But if you turn away [from accepting my doctrine of Islamic monotheism, i.e. to worship none but Allah], then no reward have I asked of you; my reward is only from Allah, and I have been commanded to be of the Muslims (i.e. those who submit to Allah's Will)."

(54) "And (it is revealed to me): Direct your face (O Muhammad صلى الله عليه وسلم) entirely towards the religion Hanif (Islamic monotheism, i.e. to worship none but Allah Alone), and never be one of the Mushrikun (those who ascribe partners to Allah, polytheists, idolaters, disbelievers in the Oneness of Allah, and those who worship others along with Allah).

(55) Those who hinder (others) from the Path of Allah (Islamic monotheism), and seek a crookedness therein, while they are disbelievers in the Hereafter.

(56) Verily, those who believe (in the Oneness of Allah - Islamic monotheism) and do righteous good deeds, and humble themselves (in repentance and obedience) before their Lord, they will be dwellers of Paradise to dwell therein forever.

(57) He said: "O my people! Tell me, if I have a clear proof from my Lord, and a Mercy (Prophethood) has come to me from Him, but that (Mercy) has been obscured from your sight. Shall we compel you to accept it (Islamic monotheism) when you have a strong hatred for it?

(58) They said: "O Salih! You have been among us as a figure of good hope (and we wished for you to be our chief) till this [new thing which you have brought that we leave our gods and worship your God (Allah) Alone]! Do you (now) forbid us the worship of what our fathers have worshipped? But we are really in grave doubt as to that to which you invite us (monotheism)."

(59) So stand (ask Allah to make) you (Muhammad صلى الله عليه و سلم) firm and straight (on the religion of Islamic monotheism) as you are commanded and those (your companions) who turn in repentance (unto Allah) with you, and transgress not (Allah's Legal Limits). Verily, He is All-Seer of what you do.

(60) Except him on whom your Lord has bestowed His Mercy (the follower of truth - Islamic monotheism) and for that did He create them. And the Word of your Lord has been fulfilled (i.e. His Saying): "Surely, I shall fill Hell with jinn and men all together."