Good Hair Day, often abbreviated to GHD, is a manufacturer of haircare products. GHD leads the market for hair straightening irons and is sold in over 50,000 salons worldwide.

Martin Penny, Gary Douglas, Susan Powls, and Robert Powls founded GHD in January 2001. The three collaborated to buy the rights to a hair straightening iron from an inventor in South Korea. The brand grew organically from word of mouth and began their first advertising campaign two years later. By then, hair salons had purchased £12 million of stock, against a forecast of between £3 million and £4 million.

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