We examine nonresponse in the Rice University Religion among scientists in International Context (RASIC) survey. RASIC was a web survey withtelephone follow-up of members of biology and physics departments in French, Italian, Turkish, and U.S. universities and research institutes. Our analyses provide a guide for other studies of academic populations with respect to response rates for a typical web survey design and with respect to patterns of unit and item nonresponse. We first examine cross-national differences in response rates (highest in Italy and the U.S., lowest in Turkey). The timing of response is examined next, noting localized influences on the pattern of responses (e.g., holidays and the timing of reminders and telephone follow-up). This is followed by analysis of variations in response rate within country by characteristics of scientists, including academic rank, discipline, gender, and elite/nonelite status of institution. Differences between early and late respondents are then examined to allow for the use of the wider range of variables measured in the survey itself, including measures of religious belief. Finally, we examine which items were associated with break-off and item nonresponse:questions on religion, for example, could be controversial in some countries. The results of this analysis will provide data on rates and patterns of nonresponse in academic populations in the countries studied. RASIC data collection was funded by the Templeton World Charity Foundation, grant TWCF0033.AB14, Elaine Howard Ecklund, PI, Kirstin RW Matthews and Steven W. Lewis, co-PIs.