Here are the top global pizza chains (ranked roughly by number of worldwide outlets and overall system sales). Numbers and positions can shift year-to-year depending on openings/closings and whether you rank by units or by sales — I cite recent industry sources below.

Top pizza chains worldwide (approximate order)

1. Domino’s — Largest by global sales and one of the largest by store count (global leader in systemwide sales). (qsrmagazine.com)
2. Pizza Hut — Very large global footprint (one of the top two for worldwide outlets and system sales). (qsrmagazine.com)
3. Papa John’s — Among the world’s largest chains by number of restaurants (growth in recent years). (statista.com)
4. Little Caesars — Major global/U.S. chain (large unit count and high U.S. sales). (qsrmagazine.com)
5. Dodo Pizza (Dodo Brands) — Rapidly growing Russian-founded chain with 1,000+ locations internationally. (brandradar.org)
6. Telepizza / Telepizza Group (incl. recent rebrands/mergers) — Large Spanish-based group with substantial international units. (brandradar.org)
7. Marco’s Pizza — A top U.S. chain that has grown into the global/top-U.S. lists (1,000+ locations). (qsrmagazine.com)
8. Papa Murphy’s — Major take-and-bake chain (roughly 1,000+ stores, mostly U.S.). (qsrmagazine.com)
9. PizzaExpress and similar regional brands — Important international/regional players (UK-based PizzaExpress, many country-level chains like MOD, Telepizza in Spain/Latin America). (brandradar.org)
10. Other notable chains: Sbarro, Round Table/California Pizza Kitchen (regional/global presence varies), many large national/regional groups in China, India, Brazil and Europe. (qsrmagazine.com)

Notes and caveats

• “Top” can mean different things: total global units (store count), systemwide sales (revenue), or market value. Domino’s leads by global systemwide sales; Pizza Hut and some others can have comparable or larger unit counts in certain years. (qsrmagazine.com)
• Counts and rankings change frequently (franchise openings/closures, acquisitions, master-franchise agreements). The sources I used are recent industry reports (QSR, Statista) and company reporting — if you want an exact, up‑to‑date numeric ranking (units and/or 2024–2025 sales for each brand) I can pull the latest verified counts for each chain and show a side‑by‑side table with sources. (qsrmagazine.com)

Would you like a ranked table showing current store counts and 2024–2025 sales for each brand (with sources)?