Obesity
As usual, the interpretation of this dream depends on you. You may be concerned about your looks and fear that you are becoming fat. Be realistic in regard to this area of your life. If you are very thin and can not stop worrying about your weight, you should see a doctor. Psychologically speaking, obesity usually is a sign that the individual has issues with self-esteem and personal power. In dreams about obesity fat emotionally insulates us from others and isolates us physically.

Obstacle
Dreaming of obstacles to you progress can indicate that you are uncertain of your ability to achieve your goals in life. You lack self-confidence and may feel unable to do the things you want to do. You may feel that you are being tested in some way. The barrier may or may not be self-imposed. It may represent a social distinction of some inner difficulty that is restricting your self-expression.
Mystical Meaning - Ramana Maharshi said: "There are no impediments to meditation. The very thought of such obstacles is the greatest impediment." And so to with your dream: imagined obstacles always seem so much bigger than real ones.

Ocean
It traditionally represents our great unconscious, memories, emotions, and individual soul and collective experiences. Look at all of the details in this dream. Is the water clear or murky? Is it calm or turbulent? Are you catching fish, or are you stranded and afraid? Look, listen, and try to comprehend the messages in this dream. No one is in a better position to give meaning to your dreams than you can. Concentrate and learn for yourself.

Octopus
If the dream makes you happy, it implies that you may be involved in many different activities or adventures. If there is a negative emotional reaction to the dream, it suggests that unhealthy attachments and entanglements are present in daily life.

Office
A dream set in a working environment is most likely to be describing your conduct and the way you present yourself to the world. Offices are also organized places with everything neatly filled. The dream may be telling you to be more organized.
Mystical Meaning - If you dream of being happy in an office, it is a sign of prosperity. If you are turned out of an office, expect disapointments.

Oil
The content of the dream will tell you if its message is about wealth, religion, spirituality, or sex. Traditionally, oil is used as a part of many religious sacraments. It represents wealth for people who own it, and it also may have sexual connotations. What does it mean for you?
Mystical Meaning - Superstition says that if a man dreams he is dealing in oil, he will be rich, but unsuccessful at lovemaking.

Ointment
This is probably a symbol of healing. Something may have entered your life that feels like a soothing balm and that relieves your bruises from the past.
Mystical Meaning - Dreaming of ointment predicts that you will make new friends.

Old Man/Old Woman
Carl Jung said that the wise old man is the "archetype of the spirit" and the "speaking fountainhead of the soul." Dreaming about him may attempt to bring the dreamer into awareness of the larger meaning of ones life. Old people in dreams represent wisdom and maturity. They may appear in our dreams at times of confusion and lack of direction, or when we need consultation and help in decision-making.

Opening
Opening something can symbolize a new influence entering your life. You may feel inspired with new ideas soon. Ask yourself whether you are opening yourself to beneficial spiritual influences or less savory ones.
Mystical Meaning - To dream of opening a door denotes slander from enemies.

Opponet
An opponet may be an aspect of yourself. You may have an inner conflict or be wrestling with a problem.
Mystical Meaning - It is said to be unlucky to dream of triumphing over an opponent, for it shows you have malicious enemies who will succeed in harming you.

Opposites
Opposites in a dream represent the opposite qualities of the psyche. This can include masculine and feminine, extrovert and introvert, active and passive, and will be represented by symbols such as light and dark, left and right, man and woman, ect. The brain is split into two distinctive hemispheres that have different functions. Dreams may help to bring these functions together as one harmonious whole.
Mystical Meaning - The yogi resolves the opposites by merging with the infinite. Reflect on the meaning of your dream in the light of this quote from the Bhagavad Gita: "By passion for the 'pairs of opposites.' By those twin snares of Like and Dislike, Prince, All creatures live bewildered, save some few who, quit of sins, holy in act, informed, Freed from the 'opposites' and fixed in faith, cleave unto me."

Orange (Color)
The color orange corresponds to the second chakra and, at times, may be associated with our reproductive system. The second chakra is said to be responsible for our reproductive health and has something to do with our sexual expression. Many people have requested that this color be added into the dream dictionary, However, it is very difficult to make any correlation between its symbolism and a particular area of life. Consider your sexual and reproductive health and then make other associations in order to obtain a personal interpretation of the color orange.

Orphan
Your dream may be saying that you feel lonley, unloved, and rejected. Alternatively, the orphan may represent some part of yourself that you have rejected.
Mystical Meaning - Dreams of orphans foretell profits from rich aquaintances but unhappiness in matters of the heart.

Oven
The most obvious symbolism is that of a womb. You may be having some fears or anticipation in regard to having children. A warm oven is said to have "fruitful," or positive, connotations while a cold oven the opposite. Of course, an oven may simply represent housekeeping and cooking.
Mystical Meaning - To dream you are cooking at an oven is a sign of a change. If the oven is hot, the change will be for the good, but it it's cold, watch out!

Owl
It is another symbol for the unconscious. It usually represents wisdom and virtue, and your unconscious may be giving you important massages, so pay attention to the details in the dream. In the American Indian tradition, the owl is considered to be the eagle of the night. Dreaming about owls is a powerful dream, which may indicate that changes are on the way. Superstition based dream interpretations suggest that dreaming about an owl is a negative omen, which indicates a reversal in good fortune. An owl in the house predicts family arguments and chasing it away might cause things to work out for the best.
Mystical Meaning - Superstition says that this is a melancholy dream predicting sadness, poverty, and sometimes disgrace.

Oyster
An oyster in your dream may have sexual connotations. It usually represents the female sex organ or, if eaten by a man, may represent his ability or desire to perform well sexually. Oysters are also considered symbols of humility and wisdom. Their meaning is associated with that of pearls. The most negative interpretation is that the oyster represents a well guarded individual; a person who has shut himself off from others. Attempt to connect some of these ideas to your emotional life and overall experiences and keep in mind the setting, context and outcome of the dream.