Below are well-known Melbourne hotels that offer private-event / function facilities (ballrooms, private dining rooms, boardrooms and larger conference spaces). I’ve included the key venue type and typical capacities and a source you can contact for quotes or availability.

• Crown Melbourne (Crown Towers / Crown Metropol / Crown Promenade) — multiple private event spaces from intimate private dining rooms (30–100 pax) up to large conference halls and ballrooms (hundreds). Venues include M Rooms, Conference Hall, Conservatory and exclusive level/rooftop spaces (Horizon, Evergreen). (crownmelbourne.com.au)

• The Langham, Melbourne (Southbank) — elegant function rooms and a large ballroom; flexible rooms for intimate private dining up to ~400 guests in the ballroom. Good for weddings, corporate dinners and conferences. (langhamhotels.com)

• Grand Hyatt Melbourne (Collins Street / Paris end) — multiple ballrooms (Savoy, Mayfair) and private-style “The Residence”; capacities range from small boardrooms to ballrooms for several hundred guests. Strong AV and event-planning support. (grandhyattmelbevents.com)

• Park Hyatt Melbourne — luxury ballroom and several private dining/meeting rooms; ballroom capacity up to several hundred (cocktail/banquet options) and intimate private spaces (e.g., “Cuba” private room inside Radii). Suitable for upscale private dinners and corporate events. (eventsathyatt.com)

• The Ritz‑Carlton, Melbourne — large Grand Ballroom and multiple private event/boardroom options across two event levels; suited to gala dinners, conferences and private dining (ballroom capacities into the high hundreds, private dining options on Level 80). (ritzcarlton.com)

• Sofitel Melbourne on Collins — award-winning Grand Ballroom plus several ballrooms and private suites (flexible breakdowns, capacities from intimate private dining to 800+ seated in the Grand Ballroom when configured). Good for theatrical or formal events. (sofitel.accor.com)

• The Westin Melbourne — multiple function rooms including a private Wine Room, boardrooms and larger Westin rooms; capacities up to ~150–200 in larger function spaces; popular for private dining, meetings and mid-size receptions. (marriott.com)

• The Hotel Windsor — historic hotel with several private function rooms (Albert Room, Garden Room, Bourke Room etc.); ideal for intimate to mid-size private functions, high tea events and classic-style dinners (dozens to a few hundred depending on room). (thewindsor.net.au)

• (If you want casino/entertainment-style large-scale options) Crown’s complex also includes multiple specialty private venues and large-capacity conference halls suitable for product launches, exhibitions and very large private events. (crownmelbourne.com.au)

Next practical steps (suggested)

• Use the hotel event/meetings pages above to view room layouts, capacity charts and sample menus, then contact the hotel’s private-events or sales team (phone/email usually listed on those pages) for availability, pricing, AV packages and minimum-spend/room-hire terms. The sources above link directly to each hotel’s events/contact page. (langhamhotels.com)

If you’d like, I can:

• Narrow this list by area (CBD, Southbank, Docklands), guest count, budget or date; or
• Pull contact emails/phone numbers and the most relevant room capacities for a specific guest-count you have in mind.

(If you want me to narrow or pull contact details, tell me the guest count, preferred neighbourhood and any other must-haves and I’ll prepare a short shortlist with direct contact details and capacity/price notes.)