- Waasland (Football)
- Waasland-Beveren (Football)
- Wadi Camacho (Boxing)
- Wagner (American Football)
- Wagner (Basketball)
- Waikato (Rugby Union)
- Waikato Bay of Plenty Magic (Netball)
- Waikato Women (Rugby Union)
- Wake Forest (American Football)
- Wake Forest (Basketball)
- Wakefield Trinity (Rugby League)
- Wales (Rugby Union)
- Wales (Football)
- Wales (Rugby League)
- Wales (Netball)
- Wales (Hockey)
- Wales Minor Counties (Cricket)
- Wales U20 (Rugby Union)
- Wales U21 (Football)
- Wales Women (Rugby Union)
- Wales Women (Football)
- Wales Women (Lacrosse)
- Wales Women (Rugby League)
- Walid Ouizza (Boxing)
- Wallsend Women (Football)
- Walsall (Football)
- Waratahs (Rugby Union)
- Warminster Town Ladies (Football)
- Warrington Wolves (Rugby League)
- Warrington Wolves Foundation Women (Football)
- Warrington Wolves Women (Rugby League)
- Warriors (Rugby League)
- Warriors (Cricket)
- Warriors Women (Cricket)
- Warriors Women (Rugby League)
- Warwickshire (Cricket)
- Warwickshire (Hurling)
- Warwickshire 2nd XI (Cricket)
- Warwickshire Women (Cricket)
- Washington (Basketball)
- Washington (American Football)
- Washington Capitals (Ice Hockey)
- Washington Commanders (American Football)
- Washington Football Team (American Football)
- Washington Freedom (Cricket)
- Washington Mystics (Basketball)
- Washington Nationals (Baseball)
- Washington Nationals Futures (Baseball)
- Washington Nationals Prospects (Baseball)
- Washington Spirit (Football)
- Washington State (American Football)
- Washington State (Basketball)
- Washington Wizards (Basketball)
- Washington Women (Football)
- Wasps (Rugby Union)
- Wasps FC Ladies (Rugby Union)
- Wasps Netball (Netball)
- Water and Power Development Authority (Cricket)
- Waterford (Football)
- Waterford (Gaelic Football)
- Waterford (Hurling)
- Watford (Football)
- Watford FC Women (Football)
- WBC TBC (Baseball)
- Wealdstone (Football)
- Weber State (American Football)
- Wellington (Rugby Union)
- Wellington (Cricket)
- Wellington Phoenix (Football)
- Wellington Pride (Rugby Union)
- Wellington Women (Cricket)
- Welsh Fire (Cricket)
- Welsh Fire (Women) (Cricket)
- Wem Town Ladies (Football)
- Werder Bremen (Football)
- West Adelaide (Australian Rules Football)
- West Bromwich Albion (Football)
- West Bromwich Albion U21 (Football)
- West Bromwich Albion WFC (Football)
- West Coast Eagles (Australian Rules Football)
- West Didsbury & Chorlton Women (Football)
- West Ham United (Football)
- West Ham United U21 (Football)
- West Ham United Women (Football)
- West Indies (Cricket)
- West Indies A (Cricket)
- West Indies A Women (Cricket)
- West Indies Academy (Cricket)
- West Indies Champions (Cricket)
- West Indies Championship XI (Cricket)
- West Indies Legends (Cricket)
- West Indies Masters (Cricket)
- West Indies President's XI (Cricket)
- West Indies Select XI (Cricket)
- West Indies Under-19s (Cricket)
- West Indies Women (Cricket)
- West Indies Women Under-19s (Cricket)
- West Indies Women XI (Cricket)
- West Perth (Australian Rules Football)
- West Team (American Football)
- West Virginia (American Football)
- West Virginia (Basketball)
- West Virginia Mountaineers (Baseball)
- West Zone (Cricket)
- West Zone Women (Cricket)
- Westdyke Ladies (Football)
- Western Australia (Cricket)
- Western Australia Women (Cricket)
- Western Australia XI (Cricket)
- Western Bulldogs (Australian Rules Football)
- Western Carolina (American Football)
- Western Illinois (American Football)
- Western Kentucky (American Football)
- Western Kentucky (Basketball)
- Western Magpies (Australian Rules Football)
- Western Michigan (American Football)
- Western Province (Cricket)
- Western Province (Rugby Union)
- Western Province Under-19s (Cricket)
- Western Province Women (Cricket)
- Western Storm (Cricket)
- Western Sydney Wanderers FC (Football)
- Western United FC (Football)
- Westmeath (Hurling)
- Westmeath (Gaelic Football)
- Weston-super-Mare (Football)
- Wests Tigers (Rugby League)
- Wexford (Hurling)
- Wexford (Gaelic Football)
- Weymouth (Football)
- Weymouth Women (Football)
- Whitby Town (Football)
- White Town DropThought Giants (Cricket)
- Whitehaven (Rugby League)
- Whitehill Welfare (Football)
- Whitstable Town (Football)
- WI Brathwaite XI (Cricket)
- WI Holder XI (Cricket)
- WI Roston Chase XI (Cricket)
- Wichita State (Basketball)
- Wick Academy (Football)
- Wicklow (Hurling)
- Wicklow (Gaelic Football)
- Widnes Vikings (Rugby League)
- Wigan Athletic (Football)
- Wigan Athletic Ladies (Football)
- Wigan Warriors (Rugby League)
- Wigan Warriors Women (Rugby League)
- Wigtown & Bladnoch (Football)
- Wilfredo Mendez (Boxing)
- Willem II (Football)
- William & Mary (American Football)
- William & Mary (Basketball)
- William Scull (Boxing)
- William Zepeda (Boxing)
- Williamson XI (Cricket)
- Willy Hutchinson (Boxing)
- Wilston Grange (Australian Rules Football)
- Wiltshire (Cricket)
- Wiltshire Women (Cricket)
- Winchester City Flyers Women (Football)
- Windward Islands (Cricket)
- Windward Islands Women (Cricket)
- Winnipeg Blue Bombers (Canadian Football)
- Winnipeg Jets (Ice Hockey)
- Winthrop (Basketball)
- Wisconsin (American Football)
- Wisconsin (Basketball)
- Wisła Kraków (Football)
- Wofford (Basketball)
- Wofford (American Football)
- Woking (Football)
- Wolfhounds (Rugby Union)
- Wolverhampton Wanderers (Football)
- Wolverhampton Wanderers U21 (Football)
- Wolverhampton Wanderers Women (Football)
- Wolves (Cricket)
- Wonders Club Noida (Cricket)
- Woodley United Ladies (Football)
- Worcester Cavaliers (Rugby Union)
- Worcester City Women (Football)
- Worcester Warriors (Rugby Union)
- Worcester Warriors Women (Rugby Union)
- Worcestershire (Cricket)
- Worcestershire 2nd XI (Cricket)
- Worcestershire Women (Cricket)
- Worksop Town (Football)
- World Giants (Cricket)
- World XI (Cricket)
- World XV (Rugby Union)
- Worthing (Football)
- Worthing Women (Football)
- Wrexham (Football)
- Wright State (Basketball)
- Wroxham Women (Football)
- Wuhan Three Towns (Football)
- Wuhan Yangtze River (Football)
- Wyberton Wildcats Women (Football)
- Wycombe Wanderers (Football)
- Wydad Casablanca (Football)
- Wymondham Town Women (Football)
- Wynnum Seagulls (Rugby League)
- Wyoming (American Football)
- Wyoming (Basketball)
- Wythenshawe Women (Football)