The body is scheduled to hold its first meeting on Thursday.
Nawrocki told broadcaster Polsat News on Sunday that no decision had been made on whether he would travel to Washington to attend the gathering.
He said he remained in contact with the US administration and several European leaders ahead of the event.
"I believe Poland's presence on the Board of Peace would be beneficial," Nawrocki said.
"We would be the voice of the entire region," he added.
US President Donald Trump said on Sunday that the meeting would take place at the US Institute of Peace in Washington.
US President Donald Trump. Photo: EPA/LAURENT GILLIERON
Delegations from more than 20 countries, including heads of state, are expected to attend.
Romanian President Nicușor Dan said in a Facebook post over the weekend that he would participate as an observer.
Hungarian Prime Minister Viktor Orban, a close Trump ally, said earlier this month that he would travel to Washington for the meeting.
Nawrocki, a pro-Trump conservative, attended the launch of the Board of Peace last month at the World Economic Forum in Davos, Switzerland.
While he was present at the signing ceremony, he did not sign the initiative’s founding charter, Polish media reported.
Polish President Karol Nawrocki and US President Donald Trump meet on the sidelines of the 56th annual World Economic Forum in Davos, Switzerland on January 21, 2026. Photo: Mikołaj Bujak/KPRP
Nawrocki said at the time that Poland viewed participation in the initiative as important but added that any international agreement must fully comply with the country’s constitution and legal procedures.
Poland's centrist Prime Minister Donald Tusk said last week that Poland would not join the US-led initiative "under current conditions," citing uncertainty about its structure and objectives.
Tusk told reporters that Poland’s embassy in Washington had received an open invitation to the first meeting, addressed to either the president or the prime minister.
"This is the moment to clearly state that under current circumstances—concerning the Board’s principles, legal status and primary aims—Poland will not join the initiative,” Tusk said. "We will continue to monitor the situation with flexibility and openness."
He added that maintaining strong relations with the United States remains a priority for Poland and did not rule out joining the Board of Peace in the future if conditions change.
"If the president, as an observer, decides to attend the meeting in the US on February 19, he will be briefed by the government on how to proceed," Tusk said.
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Source: Polsat News, IAR, PAP