Exhibit 31.1

CERTIFICATION

I, Peter I. Cittadini, certify that:

1. I have reviewed this annual report on Form 10-K/A of Actuate Corporation (the “registrant”);

2. Based on my knowledge, this report does not contain any untrue statement of a material fact or omit to state a material fact necessary to make the statements made, in light of the circumstances under which such statements were made, not misleading with respect to the period covered by this report;

Dated: August 17, 2009

/s/ Peter I. Cittadini  

Peter I. Cittadini 

President and Chief Executive Officer
(Principal Executive Officer)