Only 32 percent of NATO nations think the defense spending should be increased, while 47 percent want it to remain at the current level, according to the survey.
However, 14 percent of the polled said the spending should be decrease.
The Netherlands and Poland are the top two countries in support of the increased military spending, while Spain, Italy and Greece would like to invest less.
"Americans are torn between maintaining current spending (40 percent) and increasing the defense budget (35 percent)," the poll suggests.
At the same time, majority of Greeks, or 69 percent, have unfavorable views of NATO.
The next NATO summit is scheduled to take place in Warsaw, Poland on July 8-9.