You need a visa for Singapore if you have an Iranian passport
Visa options for Singapore
Electronic visitor visa may be available
Travellers need a visa to visit Singapore for Business or Tourism. A Singapore eVisa is the fastest and easiest way of obtaining a visa for Singapore because travellers can submit their application and supporting documents online. Once the application is approved, travellers receive their eVisa confirmation electronically. Travellers need an eVisa if they arrive in Singapore by air. Travellers can apply for an eVisa through an authorized visa agent, strategic partner, or a local contact in Singapore. A valid visa is required to board the flight. If the visa is expired or doesn’t match the traveller’s passport information, travellers will not be able to board their flight.