The Shikoku proportional representation block (Hirei [daihyō] Shikoku burokku (比例[代表]四国ブロック)) is one of eleven proportional representation (PR) "blocks", multi-member constituencies for the House of Representatives in the Diet of Japan.

In three elections after the consolidation of the LDP-DPJ-party system by the merger of the LP into the DPJ in 2001, only the top three parties were able to win seats in Shikoku.

In 2012, the LDP recorded its worst result since the introduction of proportional party list voting and the DPJ vote share crashed by more than 25 percentage points, the newly created Japan Restoration Party managed to gain two proportional seats in Shikoku.

The 2012 general election delivered a landslide victory to the LDP, with 294 of the 480 seats won at the national level.

Junya Ogawa lost his seat in Kagawa 1st district but was the DPJ candidate to suffer the narrowest defeat, so he was able to retain a seta in the house.