"Put aside the false hopes and fears and join the decisive majority who consciously and courageously said no to the Islamic Republic," Pahlavi said in a video message Wednesday. "Don't let them kill our children in your name and on the back of your vote."
Official figures released by Iran's Interior Ministry put the turnout in the first round held on July 28 at 39.92 percent, the lowest recorded since the establishment of the Islamic Republic in 1979.
Reza Pahlavi on Wednesday quoted a tweet by Iran's Supreme Leader Ali Khamenei about the people's low turnout in the Friday's vote, and said, "Last week the Iranian nation humiliated your illegitimate regime. This week Iranians will again say no to your Election Circus as they seek to reclaim the freedom, dignity & prosperity you have stolen."
"Iran will succeed and relegate your dictatorship to the ash heap of history," he added.
Pahlavi's call for election boycott echoes that of many other Iranian activists who have boycotted Iran's presidential elections, making the turnout the central theme of this campaign.
Another prominent exiled opposition figure, Hamed Esmaeilion, had earlier published a post on X, praising those who did not vote in the first round last week, and inviting them to stay the course.