Matplotlib X-axis Label - Python Guides Use the xlabel () method in matplotlib to add a label to the plot's x-axis. Let's have a look at an example: # Import Library import matplotlib.pyplot as plt # Define Data x = [0, 1, 2, 3, 4] y = [2, 4, 6, 8, 12] # Plotting plt.plot (x, y) # Add x-axis label plt.xlabel ('X-axis Label') # Visualize plt.show ()