Doi Toshitsura (土井 利位, June 15, 1789 – July 31, 1848) was a Japanese daimyō of the Edo period, who ruled the Koga Domain.

[2] One of Toshitsura greater cultural legacies are the diagrams he made of 86 types of snowflakes that he catalogued in a book he titled the Sekka zusetsu, published in 1832.

[6] Toshitsura decision to bring his vassal Takami Senseki, a prominent retainer of the Koga Domain, to Nagaskiin 1836 resulted in the reproduction of a 'world map' which modern scholars have celebrated for relating trade routes and art of the time.

Despite his previous support for Tadakuni's reforms, this threatened to render him financially insolvent due to debts owed to his peasants.

When he failed to negotiate a settlement with his peasants he instead attempted to oppose the Shogun's requests, a decision that rivals tried to pressure him with.