Most people have a strong need to protect their privacy. The dream of an intruder can therefore mean that the dreamer feels threatened. The intruder as a dream symbol stands for fear which has a connection with power and violence against others.
The dream of an intruder usually denotes the fear to be threatened sexually.
At the spiritual level, the dreamer is afraid of a desecration. The dreamer is a sacred, inviolable space and doesn’t want to accept everyone or everything. The intruder is the part of one’s personality that can not deal with fears and doubts.