"I Need a Doctor" is a single by American rappers Dr. Dre and Eminem and recording artist Skylar Grey. The song is produced by British record producer Alex da Kid, mixed by Dr. Dre, and was released for digital download through the American iTunes Store on February 1, 2011.

Musically, "I Need a Doctor" is predominantly a rap song, backed by a "spacey", drum-heavy production, with extra piano keys featured in the introduction and the chorus. Lyrically, the song is largely about Dr. Dre and Eminem's close friendship, and how they have often needed and inspired each other in the past.

Even though the song was leaked onto the Internet several months in advance of its release, it became a significant commercial success on its official release, particularly in the United States, where it peaked at number 4 on the Billboard Hot 100, becoming Dr. Dre's second highest peaking song on the chart ever, and also peaking in the upper regions of many national charts. As of October 2011, it has sold over 2,206,000 digital copies in the United States alone. This makes it Dr. Dre's first song to reach this point.

The official version premiered through Dre's official website. The artists co-wrote the song with its producer, English producer Alex da Kid, who marks his second songwriting collaboration with Eminem and Grey; Eminem's hit single "Love the Way You Lie" was written by the three. In an interview with MTV News, Kid simply described his experience of working with Dr. Dre as "amazing": "He's one of my favorite producers of all time. Everybody knows how much of a perfectionist he is: He's been working on his album for 11 years. For him to bring me in, trust me, not micro-manage me, and let me bring what I do to the table, I can't even describe how that makes me feel."

In an interview with WiLD 94.9, Skylar Grey revealed that the genesis of the song's recording was when Eminem invited her and Alex da Kid to Detroit to work on his upcoming studio album with him and Dr. Dre. She said that [she and da Kid] came to the studio with the hook and "the track" prepared; [Dre and Eminem] loved it. Eminem had then went into the backroom, and came out two hours later, and said that he was done writing his verses. Grey also said that she was in tears when she heard Eminem's verses for the first time and that da Kid initially proposed featuring Lady Gaga on the hook, but Eminem insisted on having Grey's vocals, and said that they were not taking her voice off the track. In the song Eminem raps two verses about his mentor, thanking Dre for believing in him in his early days and returning the favor, before Dre delivers the song's final verse.

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