# How to Set a Single Main Title for All the Subplots in Matplotlib

We use `set_title(label)` and `title.set_text(label)` methods to add titles to individual subplots in Matplotlib. However, to add a main title common to all the subplots we use `pyplot.suptitle()` or `Figure.suptitle()` methods.

## `pyplot.suptitle()` to Add Main Title for All the Subplots

We use `matplotlib.pyplot.suptitle()` method to set main title common to all subplots in Matplotlib.

``````import numpy as np
import matplotlib.pyplot as plt

m1=1
c1=0

m2 = 2
c2 = 2

m3 = 2
c3 = 1

m4 = 1
c4 = 2

x=np.linspace(0,3,100)
y1 = m1*x + c1
y2 = m2*x + c2
y3 = m3*x + c3
y4 = m4*x + c4

fig, ax = plt.subplots(2, 2,figsize=(10, 8))

ax[0, 0].plot(x, y1)
ax[0, 1].plot(x, y2)
ax[1, 0].plot(x, y3)
ax[1, 1].plot(x,y4)

ax[0, 0].set_title("Line-1")
ax[0, 1].set_title("Line-2")
ax[1, 0].set_title("Line-3")
ax[1, 1].set_title("Line-4")

plt.suptitle('Various Straight Lines',fontsize=20)

fig.tight_layout()
plt.show()
``````

Output: In this example ,`axes.set_title()` method is used to add title to individual subplots while `plt.suptitle()` method is used to add main title common for all subplots. We can specify various parameters such as x co-ordinate, y co-ordinate, font size and alignments using various parameters to the `plt.suptitle()` method. In this case, the `fontsize=20` is set to make the main title distinguishable from the titles of each subplot.

## `figure.suptitle()` to Add Main Title for All the Subplots

`matplotlib.figure.Figure.suptitle()` method is also used to set the main title for all subplots in a figure.

``````import numpy as np
import matplotlib.pyplot as plt

m1=1
c1=0

m2 = 2
c2 = 2

m3 = 2
c3 = 1

m4 = 1
c4 = 2

x=np.linspace(0,3,100)
y1 = m1*x + c1
y2 = m2*x + c2
y3 = m3*x + c3
y4 = m4*x + c4

fig, ax = plt.subplots(2, 2,figsize=(10, 8))

ax[0, 0].plot(x, y1)
ax[0, 1].plot(x, y2)
ax[1, 0].plot(x, y3)
ax[1, 1].plot(x,y4)

ax[0, 0].set_title("Line-1")
ax[0, 1].set_title("Line-2")
ax[1, 0].set_title("Line-3")
ax[1, 1].set_title("Line-4")

fig.suptitle('Various Straight Lines',fontweight ="bold")

fig.tight_layout()
plt.show()
``````

Output: 