  Let $p$ be a prime. We complete the classification on pointed Hopf algebras
of dimension $p^2$ over an algebraically closed field $k$. When $\text{char}k
\neq p$, our result is the same as the well-known result for $\text{char}k=0$.
When $\text{char}k=p$, we obtain 14 types of pointed Hopf algebras of dimension
$p^2$, including a unique noncommutative and noncocommutative type.
