Actually, no! This is a common misconception.

While Albert Einstein is most famously associated with his groundbreaking theories of **relativity** (special and general relativity), he was awarded the Nobel Prize in Physics in **1921 "for his services to Theoretical Physics, and especially for his discovery of the law of the photoelectric effect."**

The theories of relativity were still controversial and not fully accepted by everyone in the scientific community at the time of the Nobel Prize decision. The photoelectric effect, on the other hand, had strong experimental evidence supporting it and was a crucial step in the development of quantum mechanics.

So, while relativity was arguably his most profound contribution, it wasn't the direct reason for his Nobel Prize.
