One-to-one or one to one is an adjective which can qualify:
- in mathematics, an injective function (one-to-one) or a bijective function (one-to-one correspondence)
- in telecommunications, one-to-one (communication)
- in computer science, one to one computing
One to One can also refer to:
- One to One, a 1980s Canadian pop music group
- One to One (Howard Jones album), an album by Howard Jones
- One to One (TV series), an Irish television programme broadcast on RTÉ One
- One to One (service), Apple's personal training service at Apple Retail Stores
- One 2 One, a British mobile telecommunications company, now part of T-Mobile
- One to One (Christine Fan album), an album by Taiwanese Musician Christine Fan
- One to One (Carole King album), a 1982 album by American singer-songwriter Carole King
See also
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