There are several metals that are harder than titanium. Some examples include:

1. Tungsten: Tungsten is one of the hardest metals known. It has an extremely high melting point and exceptional hardness, making it ideal for applications that require durability and resistance to wear.
2. Rhenium: Rhenium is another metal known for its hardness and high melting point. It is often alloyed with other metals to enhance their strength and performance in extreme conditions.
3. Chromium: Chromium is a hard and corrosion-resistant metal. It is commonly used as an alloying element in stainless steels to improve hardness, strength, and corrosion resistance.
4. Vanadium: Vanadium is a strong and hard metal that is often used as an alloying element in steel to enhance strength, toughness, and wear resistance.
5. Cobalt: Cobalt is a relatively hard metal with excellent wear resistance. It is commonly used in high-speed steel alloys and for applications that require resistance to high temperatures and abrasion.

It's important to note that hardness is just one property to consider when evaluating metals for specific applications. Other factors such as strength, density, corrosion resistance, and thermal properties also play significant roles in determining the suitability of a metal for a particular purpose.