 Ms Winfrey (R) raised $3m for Mr Obama in September |
Organisers have given out 23,000 tickets for the event.
On January 3, Iowa will hold the first caucus in the 2008 US presidential election, when activists will choose a candidate for their party's nomination.
Mr Obama's rival - Hillary Clinton - is also campaigning in the state, accompanied by her mother and daughter.
Tight race
Iowans who signed up to volunteer at least four hours of their time to the Obama campaign have been given priority tickets for the Oprah-Obama event.
Those attending the Des Moines rally will hear a speech from Mr Obama as well as from Ms Winfrey, and dozens of campaign workers will be on hand to sign up fresh volunteers for the senator's electoral operation.
Ms Winfrey announced her endorsement of Mr Obama's candidacy in May, and hosted a fundraising event in September which raised $3 million (£1.5million) for his campaign.
The race to win the Iowa caucus is very tight, with most polls showing Mr Obama, Mrs Clinton and another candidate - former Senator John Edwards - neck and neck.
Because it is the first state in the country to hold a caucus, presidential candidates are always keen to prove their electability by winning in Iowa.
Mrs Clinton is also campaigning hard in the state, and has appeared at an event with her mother Dorothy Rodham and her daughter Chelsea.
"Senator Clinton is a big fan of Oprah's, and she thinks it is great for candidates to have surrogates campaign on their behalf," a Clinton campaign spokesman said.
Mrs Clinton is also using a "surrogate" to campaign for her: Bill Clinton, her husband (and former President) has been appearing at events in another early primary state, South Carolina, while his wife campaigns in Iowa.
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