**Introduction:**
The G-8 group, also known as the Group of Eight, is an international forum consisting of eight of the world's largest economies. It was originally formed in 1975 as the Group of Six, and later expanded to include Canada and Russia, becoming the G-8. The group meets annually to discuss global economic issues and coordinate policies.

**Explanation:**
The G-8 group consists of the following countries:
- United States (USA)
- Japan
- Germany
- France
- United Kingdom (UK)
- Italy
- Canada
- Russia (suspended)

Among the given options, the country that is not a member of the G-8 group is **Spain**.

**Reasoning:**
1. **Germany**: Germany is one of the founding members of the G-8 group. It has a strong economy and plays a significant role in global economic affairs.
2. **France**: France is also one of the founding members of the G-8 group. It is known for its influential position in international diplomacy and economic policies.
3. **Italy**: Italy is another founding member of the G-8 group. It has a large economy and contributes to the discussions and decisions made within the group.
4. **Spain**: Spain is not a member of the G-8 group. Although it has a significant economy, it is not included in the G-8 due to various reasons such as its economic size, influence, and geopolitical factors.

**Conclusion:**
In conclusion, among the given options, **Spain** is not a member of the G-8 group. The G-8 consists of the United States, Japan, Germany, France, the United Kingdom, Italy, Canada, and Russia (currently suspended). It is an important forum for discussing global economic issues and coordinating policies among the world's largest economies.