Is it permissible to do Dua after Namaz?

Promised Messiah (AS) says:

All languages were created by God. One should do dua in Salat, in whatever language one is comfortable; because it affects the heart and produces humility.

Be sure to read the divine words in Arabic and learn its meaning but do dua in your own language. Those who perform Salat hastily and make long dua later are ignorant of the truth.

Salat is a time for dua. Pray a lot in Salat.

[Al Hakam, May 24, 1901]

Khalifatul Masih V (ATBA) answers the question “Why do we not raise our hands and pray like the other [non-Ahmadi] Muslims?“

As for those of your Pakistani friends or any others that raise their hands after prayer, ask them: did the Holy Prophet (sa) pray in this manner after the Salat?

This is not proven from the practice of the Holy Prophet (sa) that he would raise his hands to pray after Salat. Salat in itself is a prayer. The essence of worship is Salat. This is what has been mentioned in a Hadith. The most fundamental and basic aspect of prayer is Salat.

If we do not pray in Salat, then the Promised Messiah (as) has written that it is the equivalent of visiting a king, sitting down in his royal court, and when he asks “what do you require?,” one remains quiet and after that returns, or sits down and says things in a manner whereby they do not understand the request themselves, but then when they come out of his royal court, the person raises their hands and says “Your royal highness, please grant me such and such thing”. Is there any logic in this?

Therefore we pray in Salat, and whatever we wish to ask of Allah the Almighty, we ask for it in Salat. Praying afterwards is the same as abstaining from asking about one’s actual request and then enquiring about it after one has left.

This is something that one’s intellect cannot accept. For this reason we do not pray [after Salat] and nor is it proven from the practice of the Holy Prophet (sa) that he would raise his hands after Salat to pray.

We adopt those practices that were carried out by the Holy Prophet (sa). If the Holy Prophet (sa) raised his hands after Salat [to pray] then we would have done the same. However, reason rejects this practice altogether.

[Virtual Mulaqat, Nasirat Germany, 2023]