Consider an $n\times{n}$ grid formed by $n^2$ unit squares. We define the centre of a unit square as the intersection of its diagonals.
Find the smallest integer $m$ such that, choosing any $m$ unit squares in the grid, we always get four unit squares among them whose centres are vertices of a parallelogram.
1. **Initial Assumption and Counterexample for \( m = 2n - 1 \):**
   - We need to show that \( m = 2n - 1 \) is not sufficient. Consider choosing all the unit squares in the first row and one additional square from the diagonal. This results in \( 2n - 1 \) squares.
   - The centers of these squares lie on two lines: the first row and the diagonal. Since these lines are not parallel, no four centers can form a parallelogram. Hence, \( m = 2n - 1 \) is not sufficient.

2. **Using the Pigeonhole Principle for \( m = 2n \):**
   - We will show that \( m = 2n \) is sufficient using the pigeonhole principle.
   - Place the grid in a coordinate plane such that the center of the bottom-left square is at \((0,0)\) and each square has a side length of 1.
   - The center of a square at position \((i, j)\) in the grid has coordinates \((i + 0.5, j + 0.5)\).

3. **Counting Vectors:**
   - Consider the vectors formed by the centers of any two chosen squares. The vector between the centers of squares at \((i_1, j_1)\) and \((i_2, j_2)\) is:
     \[
     \vec{v} = ((i_2 + 0.5) - (i_1 + 0.5), (j_2 + 0.5) - (j_1 + 0.5)) = (i_2 - i_1, j_2 - j_1)
     \]
   - The coefficients \(i_2 - i_1\) and \(j_2 - j_1\) can each range from \(-(n-1)\) to \(n-1\), giving \(2n - 1\) possible values for each coefficient.
   - Therefore, there are \((2n - 1)^2\) possible distinct vectors.

4. **Applying the Pigeonhole Principle:**
   - If we choose \(2n\) points, the number of vectors formed by these points is:
     \[
     \binom{2n}{2} = \frac{2n(2n-1)}{2} = 2n^2 - n
     \]
   - By the pigeonhole principle, since \(2n^2 - n > (2n - 1)^2\) for \(n \geq 2\), there must be at least one vector that is repeated.

5. **Ensuring Non-Collinearity:**
   - The repeated vector implies that there are at least two pairs of points with the same vector difference, meaning they form a parallelogram.
   - Since the number of vectors defined by \(2n\) points is greater than the number of distinct vectors, there must be at least one set of four points forming a parallelogram.

Conclusion:
Thus, the smallest integer \( m \) such that any \( m \) unit squares in the grid always contain four unit squares whose centers form a parallelogram is \( m = 2n \).

The final answer is \( \boxed{2n} \).