From the Dream Mood dictionary:
To see a spider in your dream indicates that you are feeling like an outsider in some situation.
Or perhaps you want to keep your distance and stay away from an alluring and tempting situation.
The spider is also symbolic of feminine power or an overbearing mother figure in your life.
Alternatively, a spider refers to a powerful force protecting you against your self-destructive behavior.
If you kill a spider in your dream, then it symbolizes misfortune and bad luck.
To see a dead spider in your dream implies that you have overcome some strong feminine temptation.
Dreaming of a multi-colored or rainbow-colored spider points to a situation that you should avoid.
To see a spider spinning a web in your dream signifies that you will be rewarded for your hard work.
You will be promoted in your job or recognized for your achievement in a difficult task.
Spiders are also a symbol of creativity due to the intricate webs they spin.
On a negative note, spiders may indicate a feeling of being entangled or trapped in a sticky or clingy relationship.
It represents some ensnaring and controlling force.
You feel that someone or some situation is sucking the life right out of you.
Alternatively, if a spider is spinning a web in your dream, then it could be a metaphor for the world wide web and global communication.
To see a spider climbing up a wall in your dream denotes that your desires will be soon be realized.
To dream that a spider is coming down on you from the ceiling indicates that you are unable to escape from some relationship.
If you dream of baby spiders, then they symbolize a new or recent relationship.
To see spider eggs in a web suggest that you are not able to fully acknowledge your potential.
You are being held back from expressing yourself.
To dream that you are bitten by a spider represents a conflict with your mother or some dominant female figure in your life.
The dream may be a metaphor for a devouring mother or the feminine power to possess and entrap.
Perhaps you are feeling trapped by some relationship.
To eat a spider or dream that a spider is in your mouth symbolizes your control over a situation.
You are not afraid to exert your dominance in a relationship.
If you dream about a spider with multiple eyes, then it highlights female intuition.
Trust you gut feeling.