The U.S. Ambassador resident in Port Moresby, Papua New Guinea, also is accredited to Solomon Islands. The Solomon Islands' Permanent Representative to the United Nations also is accredited as its ambassador to the United States and Canada.

Relations with Papua New Guinea, which had become strained because of an influx of refugees from the Bougainville rebellion and attacks on the northern islands of the Solomon Islands by elements pursuing Bougainvillean rebels, have been repaired. A peace accord on Bougainville confirmed in 1998 has removed the armed threat, and the two nations regularized border operations in a 2004 agreement.