An altar is usually a raised structure or place where sacrifices are offered or incense is burned. It is usually a place of worship. Note what material the altar was made of in the dream. See Metals.

Positive: Dreaming of an altar may represent a place of sacrifice. It may mean that God is calling you to sacrifice something in your life. An altar may symbolize communion and prayer with the Lord and the need to be close to Him.

Negative: An altar in a dream could represent death or idolatry. It could also represent worshiping false gods and lifting things up above God in your life.

(Exodus 30:1-10; Revelation 8:3; Genesis 8:2-; Exodus 20:24-26; 2 Kings 11:18).