O'Day may refer to:
- Alan O'Day (born 1940), an American singer-songwriter
- Anita O'Day (1919–2006), an American jazz singer
- Aubrey O'Day (born 1984), an American singer, dancer, actress, songwriter, fashion designer, former member of the group Danity Kane
- Caroline Love Goodwin O'Day (1875–1943), an American politician
- Constance O'Day-Flannery, an American author of romance novels
- Daniel O'Day, one of northwestern Pennsylvania's earliest independent refiners to be brought into John D. Rockefeller's Standard Oil Company
- Darren O'Day (born 1982), a Major League Baseball relief pitcher for the Texas Rangers
- Devon O'Day (born 1962), an American radio personality, former plus-sized model for the Ford Modeling Agency, songwriter, and an author
- George O'Day (1923–1987), an American sailor, Olympic champion and boat designer
- Hank O'Day (1862–1935), an American right-handed pitcher, umpire and manager in Major League Baseball
- Jeremy O'Day (born 1974), an offensive lineman for the Saskatchewan Roughriders of the Canadian Football League
- Marcus O'Day (1897–1961), an American physicist
- Molly O'Day (1911–1998), an American film actress
- Molly O'Day (singer) (1923–1987), an American country music vocalist in the late 1940s
- Nell O'Day (1909–1989), an accomplished equestrian and B-movie actress of the 1930s and 1940s
- Pat O'Day (born 1934), a Pacific Northwest broadcaster and promoter
See also
- Break O'Day Council, a Local Government Area of Tasmania, encompassing the northern part of the states east coast
- Javits-Wagner-O'Day Act or JWOD, 41 U.S.C. § 46 et seq
- O'Day (crater), a prominent lunar impact crater that is located on the far side of the Moon
- O'Day (sailboat), a 17' fiberglass daysailer sailboat
- O'Day Mariner, a long sailboat based upon the hull of the Rhodes 19
- Peep o' Day Boys, a Protestant secret association in 18th century Ireland, a precursor of the Orange Order
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