U.S. and Israeli pollsters have recently surveyed public opinion about either an Israeli or U.S. attack on Iran’s suspected nuclear facilities. The questions in the following nine Israeli and American polls feature different timeframes and options.
Five U.S. public opinion polls
  Reuters/Ipsos Public Affairs, March 8-11
56% would support U.S. military action against Iran if there is evidence that Iran is building nuclear weapon
  62% of Americans would support Israel taking military action against Iran if there is evidence that Iran is building a nuclear weapon
  30% oppose Israel taking military action against Iran if there is evidence that Iran is building nuclear weapon
CBS News/New York Times, March 7-11
51% of Americans would support U.S. military action in Iran for purposes of stopping the country from developing nuclear weapon
  36% are opposed to U.S. military action against Iran
  47% of Americans believe the United States should support Israel’s military action if Israel were to attack Iran in order to prevent it from developing a nuclear weapons program
  42% believe the United States should not get involved action if Israel were to attack Iran in order to prevent it from developing a nuclear weapons program
ABC News/Washington Post, March 7-10
84% of Americans prefer direct diplomatic talks between the U.S. and Iran
  41% support U.S. military action against Iran
  53% oppose U.S. military action against Iran
  42% of Americans would support Israel bombing Iran’s nuclear development sites
  51% would oppose Israel bombing Iran’s nuclear development sites
Program on International Policy Attitudes/University of Maryland, March 3-7
69% of Americans favor continued efforts to pursue negotiations with Iran
  49% of Americans think that the United States should take a neutral stance on the question regarding an Israeli attack on Iran’s nuclear program
The Hill/Pulse Opinion Research, March 1
52% of Americans are very or somewhat supportive of an Israeli attack on Iran to destroy its nuclear program
  41 % of Americans are very or somewhat opposed to an Israeli attack on Iran to destroy its nuclear program
Four Israeli public opinion polls:
  Jerusalem Center for Public Affairs, April 27 
65% believe a strike against the Iranian nuclear facilities would be preferable to accepting an Islamic Republic which has a military nuclear capability
  60% believe only an attack could stop Iran’s nuclear ambitions
  37% believe there are other ways of averting an Iranian bomb
Israeli Haaretz Newspaper, March 8 
58% of Israelis oppose an attack on Iran without American support
Truman Institute, March 
42% of Israelis support an attack on Iran even without U.S. support
  51% oppose a strike on Iran without U.S. support
  69% favor a strike in cooperation with the U.S.
Brookings Saban Center, February 29 
19% of Israelis would support a strike without American backing
  42% of Israelis would be in favor of an attack only if the United States is on board
  34% are against an attack with or without U.S. support
