The unity candle lighting is an important part of the traditional wedding ceremony popularized in the United States. The unity candle ceremony uses two taper candles with a large pillar candle (called the "unity candle") in the center. As the ceremony begins, a representative from each family (typically the mothers of the bride and groom) light the two tapered candles. Towards the end of the ceremony (usually after the formal vows), the bride and groom light the larger pillar candle using the two taper candles.

The unity candle is typically decorated with the wedding invitation, an inscription, a picture of the couple, or other ornamentation. The candles are typically white to symbolize purity. The lighting ceremony may be accompanied by special music which is particularly meaningful to the couple, an explanation of the symbolism, or just some period of mutual gazing by the happy couple. In some circles, it is customary for the couple to save the unity candle and relight it on anniversaries.

Performance of the unity candle ceremony symbolizes the joining together of the two families, and their love for the bride and the groom, into one united family that loves the new husband and wife. At other times it symbolizes the union of two individuals, becoming one in holy matrimony and commitment. The most popular explanation of the unity candle ceremony is this. The taper candles are lit by a member from each family to symbolize the love and allegiance that the family has for the bride and groom. As the bride and groom use these two flames to light the unity candle, they bring the uniting love of both families together in a united love of the new couple. Usually, the two tapered candles are left burning and replaced in their holders (because each family's love for their own will continue). In some ceremonies they may blow out their individual candles.

When the ceremony is performed to symbolize the joining together of the bride and groom, the tapers may be blown out, to indicate that the two lives have been permanently merged, or they may leave them lit beside the central candle, symbolizing that the now-married partners have not lost their individuality. The exact origin of the unity candle is unclear. There is evidence to suggest it may have originated in the 1930s or earlier. In all likelihood, it is at least 30-40 years old. It may have become popular during the 1970's when mothers wanted a greater role in the wedding.

The lighting of a unity candle was also performed at the wedding of Luke and Laura on the TV soap opera General Hospital in 1981, which almost certainly popularized the ritual to a national, if not international, audience.

Regardless of it’s origin, the ceremony of the unity candle can have a lasting and memorable impression on the bridal couple and their guests.