There are many famous mantras in Hindu scriptures, each with its own unique meaning and significance. Here is a list of some of the most well-known mantras, along with a brief explanation of their significance:

1. Om: This is perhaps the most famous and widely-used mantra in Hinduism. It is believed to be the sound of the universe, and is often used to begin and end spiritual practices such as meditation and yoga. Om is believed to represent the divine, and is often used as a way to connect with the divine and seek blessings.
2. Gayatri Mantra: This mantra is found in the Rig Veda, and is considered to be one of the most sacred mantras in Hinduism. It is believed to have the power to remove obstacles and bring prosperity, and is often chanted as a way to seek guidance and enlightenment.
3. Maha Mrityunjaya Mantra: This mantra is also known as the “Great Death-Conquering Mantra,” and is believed to have the power to overcome death and bestow longevity. It is often chanted as a way to seek protection and blessings from the god Shiva.
4. Hare Krishna Mantra: This mantra is associated with the deity Krishna, and is believed to have the power to purify the mind and bring about spiritual realization. It is often chanted as a way to connect with Krishna and seek his blessings.
5. Shanti Mantra: This mantra is often used as a way to seek peace and tranquility. It is typically chanted at the end of spiritual practices as a way to bring about a sense of calm and balance.
6. Narayana Mantra: This mantra is associated with the deity Vishnu, and is believed to have the power to bring about prosperity and success. It is often chanted as a way to seek protection and blessings from Vishnu.
7. Lakshmi Mantra: This mantra is associated with the goddess Lakshmi, who is the goddess of wealth and prosperity. It is believed to have the power to bring about financial success and abundance.
8. Durga Mantra: This mantra is associated with the goddess Durga, who is the goddess of strength and protection. It is believed to have the power to bring about victory and protection from harm.

In addition to these mantras, there are many others that are widely used in Hinduism. These mantras are often used as a way to connect with the divine and seek blessings, and are believed to have the power to bring about positive change in the lives of those who chant them.