"On the invitation of the Norwegian Ministry of Foreign Affairs, will be travelling to Oslo for a few days," he said on Twitter.
"Looking forward to meeting and exchanging ideas with political and business leaders and research institutions."
Gandhi will miss RJD chief Lalu Prasad Yadav's show of strength in Patna on Sunday, which Congress President Sonia Gandhi is also unlikely to attend.
The Congress will be represented at the event by Leader of Opposition in Rajya Sabha Ghulam Nabi Azad, party sources said.
However, the rally is already under a cloud with BSP supremo Mayawati announcing she won't attend the event without any seat-sharing understanding among the opposition parties.
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