Poland is attending this year as a full member, following a special invitation from the United States, which holds the G20 presidency.
Sikorski is expected to speak at three plenary sessions and hold around 15 bilateral meetings, including with counterparts from India, Brazil, Mexico, Saudi Arabia and South Korea.
Warsaw also wants to participate in future G20 meetings.
Prime Minister Donald Tusk said recently that his British counterpart Andy Burnham had invited Poland to join the group's work next year, when the UK takes over the presidency.
The Polish foreign ministry says the idea has also won public backing from the European Commission and Germany.
Polish officials point to the country’s economic strength in making their case.
At a briefing before leaving for Atlanta, Sikorski underlined how far Poland had come.
"Thirty-five years ago, after we took the free-market course, the average wage in Poland was USD 40," he told reporters.
"Today it is more than USD 2,400. Polish GDP has grown by more than 1,300 percent," he said.
The foreign ministry say Poland's nominal GDP passed USD 1 trillion in September last year, ranking it 20th in the world.
The talks in Atlanta, hosted by US Secretary of State Marco Rubio, will focus on how the latest political tensions have affected the global economy, touching on freedom of navigation, food and energy security, and supply chains.
The US State Department says the meetings are intended to lay the groundwork for a leaders’ summit in Florida, where President Karol Nawrocki is expected to represent Poland on December 14-15.
Russia’s Foreign Minister Sergei Lavrov is also scheduled to attend the Atlanta talks, despite criticism from some American politicians.
He has been under Western sanctions since 2022 over Russia’s invasion of Ukraine.
Washington has invited Russian President Vladimir Putin to the December summit, but Moscow says no decision has yet been made on his attendance.
The G20, founded in 1999, brings together 19 of the world's largest economies, plus the European Union and the African Union.
Its members account for about 85 percent of global GDP and more than 75 percent of world trade.
(ał/gs)
Source: IAR/PAP