# Diocese of Quilmes anniversary and leadership transition

> Live situation record from CLSTR: https://clstr.news/situations/diocese-of-quilmes-anniversary-and-leadership-transition
> Updated: 2026-09-25T16:20:00.000Z. Sources: 9. Developments: 3.

The Diocese of Quilmes is undergoing a period of institutional transition alongside its 50th anniversary celebrations. 

On September 13, Bishop Carlos Tissera formally submitted his resignation to Pope Leo XIV after reaching the age of 75, as required by the Code of Canon Law. During a mass at the Basilica of Luján, Tissera addressed local economic difficulties, including unemployment and low wages. He will continue to govern the diocese until the Vatican officially accepts the resignation and appoints a successor.

On September 19, the diocese marked its Golden Jubilee with marches, a central Mass, and a public festival. The celebrations honored the legacy of the first bishop, Jorge Novak, and included messages from Pope Francis and Apostolic Nuncio Michael Banach. The anniversary Mass was presided over by Bishop Tissera, with a homily delivered by Archbishop Marcelo Colombo.

During the commemorative ceremony at the Quilmes Cathedral, Santiago Castagno, the municipal Secretary of Economy, presented a plaque to Tissera on behalf of Mayor Carlos Balor. The event, which included pilgrims from five regional deanates, was also attended by local authorities, including interim Quilmes Mayor Eva Mieri.

## Timeline

### 2026-09-25: Diocese of Quilmes celebrates 50th anniversary

The Diocese of Quilmes celebrated its 50th anniversary with a mass led by Bishop Carlos José Tissera and a community festival at the Quilmes Cathedral.

2 sources. https://clstr.news/cluster/diocese-of-quilmes-celebrates-50th-anniversary-1

### 2026-09-19: Diocese of Quilmes celebrates 50th anniversary

The Diocese of Quilmes celebrated its 50th anniversary with mass gatherings, a central Mass, and festivals, marking a milestone in the region while Bishop Carlos José Tissera prepares for retirement.

4 sources. https://clstr.news/cluster/diocese-of-quilmes-celebrates-50th-anniversary

### 2026-09-13: Bishop Carlos Tissera resigns from the Diocese of Quilmes

Bishop Carlos Tissera has submitted his resignation to the Pope after reaching the age of 75, announcing the decision during a mass at the Basilica of Luján in Argentina.

2 sources. https://clstr.news/cluster/bishop-carlos-tissera-resigns-from-the-diocese-of-quilmes

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Cite as: Diocese of Quilmes anniversary and leadership transition. CLSTR, https://clstr.news/situations/diocese-of-quilmes-anniversary-and-leadership-transition