Dreaming of a whale can symbolize depth, emotion, and spirituality. The meaning of this dream can vary based on your current life situation, feelings, and experiences. Your personal feelings and experiences related to whales can help you understand the significance of this dream. It may relate to various aspects of your life, including relationships, work, and personal growth.
From Imam Muhammad Ibn Seerin's Dictionary of Dreams According to Islamic Inner Traditions â entry "Whale" (page 474).
In a dream, a whale represents an oath, the temple of righteous people and the prayer mat of the devotees. Seeing a whale in a dream also means strains, depression, loss of rank, or a growing anger. Seeing the whale which swallowed God's prophet Jonah (uwbp) in a dream means dispelling one's fears, prosperity for a poor person and the coming relief for someone in distress. In a dream, a whale also represents the chief minister of sea life, while the ocean represents the king or the ruler. (Also see Fish)
Note: Islamic dream interpretation depends on the dreamer's circumstances and state. This is a general guide drawn directly from the source book.