Mersin İdmanyurdu (also Mersin İdman Yurdu, Mersin İY, or MİY) Sports Club; located in Mersin, east Mediterranean coast of Turkey in 1999–2000. Mersin İdmanyurdu (MİY) participated in Second League 1999–00 season for the 26th time. MİY couldn't attend promotion group and promotion play-offs, therefore couldn't promote. The team also participated in Türkiye Kupası (Turkey Cup) in 1999–00 and eliminated at Round 3.

Macit Özcan was club president. Ali Gültiken started to season, which was his first head coaching experience. Later Müjdat Yalman took over the team. Murat Akay was mostly appeared player, while Ersan Parlatan was top goalscorer. The stats are low this season due to withdrawal of teams who were severely affected from 1999 İzmit earthquake.

Mersin İdmanyurdu took place in Group 1 in 1999–2000 Second League season. League was played in three stages. In the first stage 50 teams in five groups (10 clubs in each) played for first two rankings to play in promotion group. The promotion group consisted of those 10 teams. At the end of the second stage top two teams promoted to 2000–01 First League. Remaining 8 teams in each ranking group played in classification groups, by carrying points and goals from ranking groups. Bottom two teams in Groups 2, 4, 5 relegated to 2000–01 Third League at the end of the season. Due to the earthquake that occurred on August 17, 1999, Sakaryaspor and Düzcespor in Group 1 and Darıca Gençlerbirliği in Group 3 withdrew from the league and demanded excuse. TFF has decided that the teams would not be relegated. One another worst team from Group 1 and two another worst teams in Group 3 had relegated at the end of the season. In the third stage, 8 clubs (3 from the promotion group and 1 each from 5 classification groups) played one-leg play-off games in Antalya Atatürk Stadium to determine the third team to be promoted to First League.

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