Can I enter Spain with a France long-stay visa?

Yes, you can enter Spain with a France long-stay visa. However, you can enter and travel to Spain for a specific period of time, i.e., up to 90 days within a 180-day period, with a French visa. There are some more regulations that you need to follow: 

1. France must be your first travel destination in the Schengen region.
2. You must spend a maximum number of days in France while you are in the Schengen area.