Absolutely! There are stars bigger than the Sun. The Sun is merely considered a dwarf (yellow) in the main sequence of stars. There are smaller stars such as red and brown dwarfs, but larger stars are massive in scale to the Sun. These are known as the giants, supergiants, and hypergiants.

If you consider the scale of the Earth to the Sun (the Sun is about 100 times as wide as the Earth), then that same scale applies for the Sun to a supergiant—and a supergiant to a hypergiant! Here is an interesting video that compares the scale of the plants to our Sun and a few super-large stars in our observable universe. click here, please