Shabbat Shirah, one of the special Shabbatot of the year, is the Shabbat on which Parashat Beshalach, including the Song of the Sea (Shirat ha-Yam), is read. The haftarah is Shoftim 4:4-5:31, which includes the Song of Devorah.
Shabbat Shuvah is a special Shabbat that occurs on the Shabbat that falls during the Ten Days of Teshuvah between Rosh ha-Shanah and Yom Kippur. The haftarah, Shuvah Yisrael, which begins with the word shuva (return), is a combination of verses: Hoshea’ 14:2-10; Micha 7:18-20; Yoel 2:15-27.
שבת זכור – A special Shabbat and the second of the Four Parshiyot, Shabbat Zachor occurs on the Shabbat preceding Purim. The maftir comes from Ki Tetze, including the commandment to remember what Amalek did to Benei Yisrael, from which its name, Zachor (“remember”), is taken; the haftarah is Shmuel Alef 15:2-34.