"BG Group today announces the board has accepted Chris Finlayson's resignation as chief executive and as an executive director of the board with immediate effect, for personal reasons," it said in a statement.
Non-executive chairman Andrew Gould will take over as interim executive chairman until a permanent replacement is appointed.
"The board of directors is fully committed to the group's strategy, which is built upon a portfolio of high-quality assets," BG said.
"The board felt that it was in the best interests of the group to accept Chris' resignation and seek fresh leadership to deliver both of these priorities."
BG Group, which unveils first-quarter results on Thursday, also warned over its annual output forecast of 590,000-630,000 barrels of oil equivalent per day.
"The Group's 2014 production guidance remains unchanged... Although production is now expected to be at the lower end of the range given the issues in Egypt," it said.
"The deterioration in Egypt will similarly impact 2015 production.
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