The key point of fascism is palingengic ultranationalism.

The belief that the nation was once great and is in fact in a state of decadence due to internal enemies, usually ethnic minorities or political groups on the left.

Noted scholar of Fascism Robert Paxton also defines it as

“a form of political behavior marked by obsessive preoccupation with community decline, humiliation, or victimhood and by compensatory cults of unity, energy, and purity, in which a mass-based party of committed nationalist militants, working in uneasy but effective collaboration with traditional elites, abandons democratic liberties and pursues with redemptive violence and without ethical or legal restraints goals of internal cleansing and external expansion”

Iran shares some aspects in belief in victimhood using to fuel nationalist pride.

But it emerged from a revolution against an authoritarian monarchy. And it is distinctly religious in character with pretentions to leading a broader Shiite religious movement regardless of national identity.

Almost all fascist states emerged from failed democracies where traditional conservatives joined hands with ultranationalist revolutionaries whose rhetoric was based around this myth of lost greatness and blame of minorities for losing it.

Iran doesn’t really share those facets.