Can We See Allah In This World?
Question

Is it possible for anyone to see Allah, may He be exalted, in this world, whether he is a believer or a disbeliever? Or is that only possible for the believers?
Praise be to Allah.Seeing Allah , may He be exalted, in this world is not possible for anyone, whether he is a believer or a disbeliever. 
Muslim (169) narrated in his Sahih that the Prophet (blessings and peace of Allah be upon him) said on the day when he warned the people about the Dajjal: “… You should know that no one among you will ever see his Lord, may He be glorified and exalted, until he dies.”
Musa (peace be upon him) asked to see Allah, may He be exalted, but Allah did not grant him that request.
Allah, may He be exalted, says (interpretation of the meaning):
{And when Moses arrived at Our appointed time and his Lord spoke to him, he said, “My Lord, show me [Yourself] that I may look at You.” [Allah] said, “You will not see Me, but look at the mountain; if it should remain in place, then you will see Me.” But when his Lord appeared to the mountain, He rendered it level, and Moses fell unconscious. And when he awoke, he said, “Exalted are You! I have repented to You, and I am the first of the believers.”} [al-A'raf 7:143]
Whoever claims to have seen Allah in this world is claiming that he is better than Musa (peace be upon him).
Shaykh al-Islam Ibn Taymiyah (may Allah have mercy on him) said:
“It is proven by the text of the Quran that it was said to Musa: {You will not see Me}, and that seeing Allah is greater than the sending down of a Book from heaven, as Allah, may He be exalted, says (interpretation of the meaning): {The People of the Scripture ask you to bring down to them a book from the heaven. But they had asked of Moses [even] greater than that and said, “Show us Allah outright.”} [an-Nisa 4:153] So the one who says that any of the people saw Him is claiming that that person is greater than Musa ibn ‘Imran, and his claim is more serious than the claim of one who claims that Allah sent down to him a book from heaven.” (Majmu‘ al-Fatawa, 2/336)
He also said:
“Everyone who claims that he has seen his Lord with his own two eyes before death, his claim is false, according to the consensus of Ahl as-Sunnah wa’l-Jama‘ah, because they are all unanimously agreed that no one of the believers can see his Lord with his own two eyes until he dies.” (Majmu‘ al-Fatawa, 3/389)
And he explained that the difference of opinion concerning that has to do with the Prophet (blessings and peace of Allah be upon him) only.
He (may Allah have mercy on him) said:
“The leading scholars of the Muslims are agreed that no one among the believers will see Allah with his own eyes in this world, and they only differed concerning the Prophet (blessings and peace of Allah be upon him), even though the majority of leading scholars are of the view that he did not see Him with his own eyes in this world.
This is indicated by the sahih reports which are proven to be narrated from the Prophet (blessings and peace of Allah be upon him) and the Sahabah and the leading scholars of the Muslims.” (Majmu‘ al-Fatawa, 2/335)
For more, please see these answers: 164119 , 14525 , 43176 and 14096 .
And Allah knows best.