Dua when something is lost
اللّهُـمَّ رادَّ الضّالَّةِ وَهادِيَ الضّالَّة، أَنتَ...
اللّهُـمَّ رادَّ الضّالَّةِ وَهادِيَ الضّالَّة، أَنتَ تَهدي مِنَ الضَّلاَلَةِ اردُدْ عَلَيَّ ضالَّتي بِقُدرَتِكَ وَسُلطانِكَ، فَإِنَّهَا مِن عَطائِكَ وَفَضلِكَ
Allahumma raddad-dallati wahadiyad-dallah, anta tahdee minad-dalalah, urdud AAalayya dallateebiqudratika wasultanik, fa-innaha min AAata-ika wafadlik
Translation
O Allah, returner of what is lost and guide of those who are astray, You guide from misguidance — return my lost item to me by Your power and authority, for it is from Your gift and favour.
When to recite
Recited when something is lost.
Source / Reference
Ibn Sunni