Much is known about the effectiveness of pre-notification for mail and telephone surveys (Dillman, 2000). Some recent research has also demonstrated the effectiveness of pre-notification for web surveys (Kaplowitz et al., 2004). However, there is a paucity of research about the effect of different types of pre-notification on web survey response rates. This paper reports on a study that examines web survey response rates by type of pre-notification. The study sample was made up of 1,439 respondents that had ever applied for a grant from a Federal granting agency using a specific type of application process. As part of an evaluation, respondents were asked to complete a survey on their experiences with the grant application process. Data from the sample frame show that some of the grant applicants had received a grant award and some had not. The current study employed an experimental design in which the respondents were randomly assigned to one of three groups that varied by type of pre-notification. The three types of pre-notification included: 1) email from the sponsoring agency with letter attachment, 2) email from the research organization with letter attachment, and 3) paper letter from sponsoring agency. The electronic pre-notification letter attachments (in .pdf format) and the mailed paper pre-notification letter were identical and from a division director at the Federal granting agency. All remaining contacts with respondents were from the research organization that conducted the evaluation. This paper will provide results on the overall web survey response rates by type of pre-notification. Since it is thought that applicants who never received a grant award would be less likely to respond to the survey than those who had received an award, the impact of the type of pre-notification on response rates is also broken out by these two respondent groups.