"Feelin' So Good" is a song recorded by American singer Jennifer Lopez for her debut studio album On the 6 (1999). The lyrics were written by Cory Rooney and Lopez, while the music was written by Steven Standard, George Logios and Sean "Puffy" Combs, who also produced the song. It was released on January 25, 2000, as the fourth single from On the 6.

"Feelin' So Good" is a midtempo hip hop song with a length of five minutes and twenty-seven seconds (5:27). The song was written by Lopez with Cory Rooney, Christopher Rios, Joe Cartagena, Sean Combs, Steven Standard and George Logios, with Combs additionally serving as the track's producer. It features rappers Big Pun and Fat Joe who often collaborated with each other. Lopez recorded her vocals for the song at Daddy's House Recording Studios and Sony Music Studios in New York City. It was later edited by Jim Janik and mixed by Prince Charles Alexander. Lyrically, the song is about Lopez being in a good mood, with nothing bringing her down. Lopez sings in the chorus: "I'm feelin' so good / I knew that I would / Been talking care of myself / Like I should / Cause not one thing / Can bring me down / Nothing in this world gonna turn me around". It contains a sample of Strafe's song "Set It Off" (1984).

Around the time of the single's release, Big Pun, who was slated to join Lopez and Fat Joe for a performance of the song on Saturday Night Live died after a heart attack related to weight issues. Lopez responded to this with a statement "He was a source of pride for the Latin community, a great artist and a great person. We will miss him terribly." The song was remixed for her J to tha L-O! The Remixes by Sean Combs, the song's original producer.

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