The Swiss Average Rate Overnight (SARON) is an overnight index of Swiss repo transactions.

The index is based on Swiss franc repo interbank market data provided by SIX Repo Ltd and is the benchmark repo transaction index which guides all Swiss Benchmark Rates.

Published by the SIX Swiss Exchange, the SARON replaced the Repo Overnight Index which was published by the Swiss National Bank.

Together with the SARTN (tomorrow/next), SARSN (spot/next), SAR1W (1 week), SAR2W (2 weeks), SAR3W (3 weeks), SAR1M (1 month), SAR2M (2 months), SAR3M (3 months), SAR6M (6 months), SAR9M (9 months), SAR12M (12 months), SARMAR (March), SARJUN (June), SARSEP (September), SARDEC (December), it makes up one of the 15 Repo transaction indexes includes in the Swiss Reference Rates (SRR).

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