Here are top-rated wedding venues in Colombo (short descriptions, typical capacities and why couples choose them). I searched official hotel pages and reputable wedding guides for current venue details—see the citations after each entry.

1. Galle Face Hotel — oceanfront heritage hotel

• Highlights: historic landmark on Galle Face Green with outdoor Chequerboard lawn (sunset ceremonies) plus Jubilee and Grand ballrooms. Popular for classic, photogenic seaside weddings.
• Typical capacities: Chequerboard up to ~1,000; Grand Ballroom ~250–280; Jubilee ~150–200. (gallefacehotel.com)

2. The Kingsbury Colombo — luxury ocean-facing hotel with lawns and ballrooms

• Highlights: large outdoor lawn “The Oval” facing the sea and multiple ballrooms; strong wedding packages and ocean views for photos/ceremony.
• Typical capacity: Oval lawns >500 guests; several ballrooms for medium–large receptions. (thekingsburyhotel.com)

3. Hilton Colombo — large pillarless ballroom & harbour/ocean views

• Highlights: centrally located near the World Trade Center, in-house wedding planners, pillarless Grand Ballroom suitable for big receptions.
• Typical capacity: Grand Ballroom up to ~900 guests. (hiltoncolombo1.com)

4. Cinnamon Grand Colombo — grand ballrooms and multiple event spaces

• Highlights: one of Colombo’s largest event portfolios (Oak Room, Atrium, Nuga Gama village setting, poolside options); well known for banquet-style weddings and multi-day celebrations.
• Typical capacity: Oak Room / largest ballrooms ~400–600 banquet (varies by configuration). (cinnamonhotels.com)

5. Shangri‑La Colombo — modern luxury with large ballrooms and ocean views

• Highlights: contemporary large ballrooms and outdoor terrace options; often chosen for upscale, large guest‑count weddings.
• Typical capacity: ballrooms that can host several hundred to over 1,000 depending on configuration. (yourhappymoments.net)

6. Taj Samudra Colombo — established five‑star hotel with ballrooms and lawns

• Highlights: long-standing reputation for quality service, flexible indoor and outdoor wedding spaces and tailored menus (good for both Western and South Asian weddings). (weddingswork.com)

7. Cinnamon Lakeside / Cinnamon Life / other city hotels — versatile choices

• Highlights: Cinnamon Lakeside (lakefront) and the newer Cinnamon Life complex offer large, modern ballrooms and rooftop/open-air options suitable for both intimate and grand weddings. Good alternatives if you want lake/city skyline backdrops. (cinnamonhotels.com)

Quick tips for choosing and booking

• Guest count first: pick venues that comfortably fit your realistic guest list (seated banquet vs cocktail standing capacities differ).
• Weather/backups: for outdoor lawn/beach ceremonies, confirm an indoor backup and whether the venue provides marquees/tents.
• Catering & cultural needs: check whether the hotel provides multi‑cuisine menus and space for traditional rituals (e.g., pheras, mehndi).
• Visit & negotiate: inspect the ballroom/lawn in person, ask for a sample menu/tasting, and request a detailed quote (what’s included vs extra).
• Book early: popular Colombo venues (weekends, auspicious dates, Poya seasons) get reserved well in advance.

Would you like:

• contact details and direct booking pages for any of these venues, or
• a shortlist filtered by budget, guest count (e.g., <150, 150–350, 350+), or type (beachfront vs ballroom)?

(I can fetch phone/email/booking links for the venues you pick.)