The presiding deity of Bhojshala Temple is Goddess Saraswati. Bhojshala Temple, also known as Kamal Maula Mosque, is a historical site located in Dhar, Madhya Pradesh, India. It is a unique structure that combines elements of both Hindu and Islamic architectural styles. The temple is dedicated to Goddess Saraswati, the Hindu goddess of knowledge, wisdom, and the arts.

Goddess Saraswati:
- Goddess Saraswati is one of the most revered deities in Hinduism. She is often depicted as a beautiful woman with four arms, seated on a lotus, and holding a veena (a musical instrument), a book, a rosary, and a water pot.
- She is considered the embodiment of knowledge, learning, music, arts, and wisdom. She is worshipped by students, scholars, artists, and anyone seeking knowledge and creativity.
- Saraswati is believed to be the source of divine inspiration and the patroness of education and learning. Her blessings are sought before starting any intellectual or creative endeavor.
- The name "Saraswati" is derived from the Sanskrit words "saras," meaning "flow," and "wati," meaning "one who possesses." Thus, she is often associated with the flow of knowledge and wisdom.

Bhojshala Temple:
- Bhojshala Temple is said to have been built during the reign of Raja Bhoja, a renowned king of the Paramara dynasty, in the 11th century. It was originally a grand temple dedicated to Goddess Saraswati, known as Saraswati Bhojshala.
- The temple complex is spread over a large area and consists of various structures, including a mandapa (hall), a sanctum sanctorum, and a large water tank known as the Saraswati Kund.
- Over time, the temple underwent several transformations. During the rule of Sultan Iltutmish in the 13th century, it was converted into a mosque and renamed Kamal Maula Mosque. Islamic elements and architectural features were added to the original structure.
- Despite its transformation into a mosque, the temple continued to be a site of reverence for both Hindus and Muslims. Even today, both communities visit the site to pay their respects to the presiding deity, Goddess Saraswati.

In conclusion, the presiding deity of Bhojshala Temple is Goddess Saraswati. The temple, which was originally dedicated to her, has a rich history and represents the unique blend of Hindu and Islamic architectural styles. It continues to be a place of worship and reverence for people of both faiths.