On the Insert tab, in the Illustrations group, click Shapes.

Under Basic Shapes, click Oval .

Click where you want the circle to start. To make the shape a circle, press and hold SHIFT while you drag to draw.

NOTES:

• You can change the look of your circle or curve by adding a shape fill or shape effect or changing the shape border.

• If you want to create a more advanced diagram like overlapping circles, an organizational chart, or a flowchart, you can create a SmartArt graphic instead of drawing each shape manually.

• By default, a circle or oval is filled. To make sure that the shape doesn't obscure the cells underneath, select the shape, and then under Drawing Tools, on the Format tab, in the Shape Styles group, click Shape Fill, and then click No Fill.