Samuel ben Joseph Strashun (1794 – March 21, 1872) (), also known as Rashash (), was a Russian Talmudist born in Zaskevich, government of Wilna. He was educated by his father, and later learnt under R. Shemariah Rabinowitz in Kreva, Belarus. He married at an early age, and settled with his wife's parents in the village of Streszyn, commonly called Strashun (near Wilna), and assumed the latter name.
The distillery owned by his father-in-law was wrecked by the invading French army in 1812, and the family removed to Wilna, where Samuel established another distillery and became one of the most prominent members of the community. His wife conducted the business, as was usual in Wilna, and he devoted the greater part of his time to studying the Talmud and to teaching, gratuitously, the disciples who gathered about him.
The Talmud lectures which for many years he delivered daily at the synagogue on Poplaves street were well attended, and from the discussions held there resulted his annotations, which are now incorporated in every recent edition of the Babylonian Talmud (Hagahot v'Chiddushei HaRashash). His fame as a rabbinical scholar spread throughout Russia, and he conducted a correspondence with several well-known rabbis. Strashun was offered the rabbinate of Suwałki, but he refused it, preferring to retain his independence.