Abu Sa'id Uthman II (Arabic: أبو سعيد عبد الله عثمان بن يوسف ابو يعقوب; Abū Sa'īd 'Abdullāh 'Uthmān ibn Yūsuf Abū Ya'qūb; [abu: saʕi:d ʕuθma:n bin ju:suf]) (December 1276 – August 1331) was the 9th Marinid sultan of Morocco, reigning from 1310 to 1331.
[2] Abu Sa'id Uthman inherited Morocco after a tumultuous period during which the Marinids had survived a dangerous rebellion in Ceuta, a long conflict with the Kingdom of Tlemcen and a severe check from Ferdinand IV of Castile, who, in the previous year (1309–10), had seized Gibraltar and laid siege to Marinid-owned Algeciras.
In 1319, facing a renewed challenge from Castile, the Naṣrid ruler Ismail I of Granada appealed to the Marinid sultan for assistance, but Abu Sa'id Uthman imposed such onerous conditions that the Granadines decided to handle the matter without him.
From his base in Sijilmasa, Abu Ali seized control of much of southern Morocco (including Marrakech), threatening to split the Marinid dominions in two.
Satisfied by the terms, Abu Sa'id Uthman arranged a diversionary raid against Tlemcen from the west, while dispatching a Marinid fleet to support the Ḥafṣid efforts in the east.