Onyeka Oshionwu of the Greens secured the strongest first-round result in Göttingen’s September 13, 2026, mayoral election with 41.44 percent, advancing to the September 27 runoff against CDU candidate Ehsan Kangarani, who received 27.86 percent. Incumbent SPD mayor Petra Broistedt did not seek re-election, and SPD candidate Florian Dinger finished third at 21.6 percent, eliminating the party that had held the office for the prior three terms. Greens also emerged as the largest force on the city council. These outcomes, combined with the two-candidate runoff format requiring a simple majority, underpin trader consensus around Oshionwu while assigning lower implied probabilities to Kangarani and eliminated contenders. The short interval before the runoff remains the key near-term variable.