Here are well-known hotels in Colombo that offer executive/club lounges and on-site business services (business centre, meeting/boardrooms). I’ve noted the lounge name or executive-floor access where available — policies (who gets lounge access, hours, paid passes) can vary so confirm with the hotel before booking.

• Shangri‑La, Colombo — Horizon Club (private club lounge on upper floors); meeting rooms/boardroom access and business centre services. (shangri-la.com)
• Taj Samudra, Colombo — Taj Club rooms with Taj Club (club lounge); 24‑hour business centre and conference/meeting rooms. (tajhotels.com)
• Cinnamon Grand Colombo — Executive Rooms / Executive Lounge (executive floor lounge with breakfast, high tea, happy hour); boardrooms and business event facilities. (cinnamonhotels.com)
• Cinnamon Lakeside Colombo — Executive (Cinnamon) Lounge on the executive floor; dedicated meeting/boardroom and business centre facilities. (cinnamonhotels.com)
• The Kingsbury Colombo — Executive Rooms with Executive Lounge privileges; 24/7 business centre and multiple meeting / conference rooms. (thekingsburyhotel.com)
• Hilton Colombo — Executive Lounge (private executive floors) plus extensive meeting rooms, ballroom and a business centre. (hilton.com)
• NH Collection Colombo (formerly Mövenpick) — Executive Lounge / “Mansion” concept (executive-room access) and multiple meeting / conference spaces and business services. (nh-collection.com)
• Galadari Hotel Colombo — Executive rooms with access to a Business/Executive Lounge; on-site business centre and conference facilities. (galadarihotel.lk)
• Galle Face Hotel — strong business/banquet facilities and a business centre (iconic historic property; lounge access varies by room/package). (gallefacehotel.com)

Notes

• Lounge access is commonly restricted to guests in Executive/Club room categories or members (and some hotels sell day-passes); confirm eligibility and opening hours directly with the hotel. (shangri-la.com)
• If you want, I can: (a) check which of these have lounge access included for a particular room type on specific dates, (b) compare meeting‑room capacities/prices, or (c) find contact info / direct booking pages for any of the hotels above. Which would you like me to do?