| Little Grebe | 1/1/2023 | Calvert BBOWT |
| Great Crested Grebe | 1/1/2023 | Calvert BBOWT |
| Black-necked Grebe | ********** | ********** |
| Cormorant | 1/1/2023 | Calvert BBOWT |
| Cattle Egret | 10/4/2023 | A full breeding-plumaged adult roosting on the main island at Spade Oak |
| Little Egret | 1/1/2023 | Stowe Lakes |
| Great White Egret | 6/2/2023 | Manor Farm |
| Grey Heron | 1/1/2023 | Stowe Lakes |
| Spoonbill | 4/6/2023 | Roosting adult at Spade Oak |
| Mute Swan | 1/1/2023 | Stowe Lakes |
| Whooper Swan | 1/1/2023 | 3 adults still just west of Cold Brayfield hamlet |
| Greylag Goose | 1/1/2023 | Manor Farm |
| Canada Goose | 1/1/2023 | Gallows Bridge Farm |
| Barnacle Goose | 12/1/2023 | With Greylag at Castleman's Farm Poultry Fields |
| Brent Goose | 1/1/2023 | Juvenile still in field NW of Foxcote Reservoir |
| Egyptian Goose | 1/1/2023 | 104 at Castleman's Farm Poultry Fields |
| Shelduck | 4/1/2023 | 3 at Spade Oak Pit |
| Mandarin Duck | 9/1/2023 | Burnham Beeches NNR and Black Park CP |
| Wigeon | 1/1/2023 | Foxcote Reservoir |
| Gadwall | 1/1/2023 | Stowe Lakes |
| Teal | 1/1/2023 | Manor Farm |
| Mallard | 1/1/2023 | Stowe Lakes |
| Pintail | 1/1/2023 | Drake at Manor Farm |
| Garganey | ********** | ********** |
| Shoveler | 3/1/2023 | College Lake (just 1 drake!) |
| Red-crested Pochard | 9/2/2023 | A female on the Crowne Plaza Pit, Marlow |
| Pochard | 1/1/2023 | Spade Oak GP |
| Tufted Duck | 1/1/2023 | Calvert BBOWT |
| Scaup | 21/3/2023 | Adult drake at Caldecotte Lake South |
| Common Scoter | 16/9/2023 | An adult drake on the main lake at College BBOWT |
| Goldeneye | 1/1/2023 | Foxcote Reservoir |
| Smew | 9/10/2023 | A female on the Jubilee River 400 yards west of Dorney Wetlands. Two more at Fulmer Lake |
| Goosander | ********** | ********** |
| Red Kite | 1/1/2023 | Hyde Heath |
| Sparrowhawk | 1/1/2023 | Dorney Common North |
| Buzzard | 1/1/2023 | Calvert |
| Osprey | 19/11/2023 | A very late juvenile on the River Chess |
| Kestrel | 1/1/2023 | Calvert |
| Hobby | ********** | ********** |
| Peregrine | ********** | ********** |
| Red-legged Partridge | 4/1/2023 | Smalldean Lane |
| Grey Partridge | 3/1/2023 | 7 at Down Farm Cereal Fields, Pitstone Hill |
| Quail | 15/7/2023 | 2 calling at Ivinghoe Hills NR |
| Pheasant | 1/1/2023 | Foxcote Reservoir |
| Water Rail | 21/1/2023 | Chesham Waterside |
| Little Crake | 7/11/2023 | A juvenile at Linford NR - my first ever in the county |
| Moorhen | 1/1/2023 | Calvert BBOWT |
| Coot | 1/1/2023 | Calvert BBOWT |
| Oystercatcher | 1/3/2023 | Pair at College Lake |
| Avocet | 1/9/2023 | A moulting adult at Dorney Common Flood |
| Little Ringed Plover | 16/3/2023 | Spade Oak Pit |
| Ringed Plover | 8/5/2023 | Spade Oak Pit |
| Golden Plover | 1/1/2023 | Gallows Bridge Farm |
| Lapwing | 1/1/2023 | 1100 at Gallows Bridge Farm |
| Knot | 24/9/2023 | A juvenile on Dorney Common Flood |
| Little Stint | 17/9/2023 | A juvenile on Dorney Common Flood |
| Temminck's Stint | 22/5/2023 | On the far spit at Spade Oak Pit found by Adam Bassett |
| Dunlin | 14/3/2023 | Dorney Common Flood |
| Ruff | 14/9/2023 | Dorney Common Flood (juvenile) |
| Jack Snipe | 30/1/2023 | Stoke Common |
| Snipe | 1/1/2023 | 3 at Spade Oak GP |
| Woodcock | 1/3/2023 | Little Linford Wood |
| Black-tailed Godwit | 8/4/2023 | 2 at College Lake from the Octagon Hide |
| Curlew | 31/3/2023 | Pair on Dorothy Bolton Meadow |
| Common Sandpiper | 8/5/2023 | Spade Oak Pit |
| Green Sandpiper | 28/3/2023 | Wapsey's Landfill Reclamation |
| Greenshank | 29/5/2023 | Spade Oak Pit |
| Redshank | 2/3/2023 | College Lake |
| Black-headed Gull | 1/1/2023 | Calvert |
| Little Gull | 10/4/2023 | 3 (2 summer adults and a 2nd-summer) at Spade Oak Pit |
| Mediterranean Gull | 16/3/2023 | A nice adult in breeding plumage at Spade Oak |
| Common Gull | 1/1/2023 | Stowe |
| Lesser Black-backed Gull | 1/1/2023 | Waddesdon |
| Herring Gull | 1/1/2023 | Spade Oak GP |
| Yellow-legged Gull | 1/3/2023 | A 4w at Newton Leys |
| Caspian Gull | 26/1/2023 | 2 adults on Blue Lagoon Bletchley |
| Glaucous Gull | 4/1/2023 | A juvenile at Springfield Landfill (observed with David J Bevan) |
| Great Black-backed Gull | 1/1/2023 | Springfield Landfill/Spade Oak GP |
| Black Tern | 1/6/2023 | On marsh at College Lake BBOWT |
| Common Tern | 31/3/2023 | Foxcote Reservoir |
| Arctic Tern | 4/11/2023 | A juvenile on Willen Lake North Basin |
| Rock Dove / Feral Pigeon | 1/1/2023 | Aylesbury |
| Stock Dove | 1/1/2023 | Stowe Park |
| Woodpigeon | 1/1/2023 | Hyde Heath |
| Collared Dove | 1/1/2023 | |
| Ring-necked Parakeet | 1/1/2023 | Dorney Common |
| Cuckoo | 6/6/2023 | 2 calling males at Linford NR |
| Barn Owl | | |
| Little Owl | 6/2/2023 | Manor Farm |
| Tawny Owl | 26/1/2023 | Ashridge Forest |
| Long-eared Owl | ********** | ********** |
| Short-eared Owl | ********** | ********** |
| Nightjar | ********** | ********** |
| Swift | 8/5/2023 | 7 at Spade Oak Pit |
| Kingfisher | 20/1/2023 | Pow Wow Lake Chesham |
| Green Woodpecker | 1/1/2023 | Stowe Park |
| Great Spotted Woodpecker | 5/1/2023 | Lower Pound Lane, Marlow |
| Lesser Spotted Woodpecker | ********** | ********** |
| Skylark | 2/1/2023 | Misbourne LNR |
| Sand Martin | 25/3/2023 | Spade Oak GP - 8 moved quickly through |
| Swallow | 28/3/2023 | 2 with at least 98 Sand Martins over Spade Oak in heavy rain |
| House Martin | 6/4/2023 | Spade Oak GP |
| Tree Pipit | 21/8/2023 | Several grounded and flyover migrants over Ivinghoe Beacon in third week of August |
| Meadow Pipit | 2/1/2023 | Misbourne LNR |
| Yellow Wagtail | 10/4/2023 | 4 males in the Marsworth Horse Paddocks |
| Grey Wagtail | 20/1/2023 | Fulmer Lake |
| Pied Wagtail | 1/1/2023 | Dorney Common North |
| Waxwing | 15/12/2023 | A flock of 7 spent 20 minutes in my garden and road |
| Wren | 1/1/2023 | |
| Dunnock | 1/1/2023 | |
| Robin | 1/1/2023 | |
| Redstart | 7/8/2023 | 3 at Rowsham |
| Whinchat | 7/8/2023 | Moulting adult at Ivinghoe Beacon sheep pens |
| Stonechat | ********** | ********** |
| Wheatear | 19/3/2023 | 2 males on the Hay Meadow at College Lake |
| Ring Ouzel | 8/4/2023 | 3 males at Ivinghoe Beacon |
| Blackbird | 1/1/2023 | |
| Fieldfare | 1/1/2023 | |
| Song Thrush | 1/1/2023 | Edgcott |
| Redwing | 1/1/2023 | |
| Mistle Thrush | 5/1/2023 | Lower Pound Lane, Marlow |
| Cetti's Warbler | 1/1/2023 | Eton Wick Roundmoor Ditch |
| Sedge Warbler | 12/4/2023 | Marsworth Reedbed |
| Reed Warbler | 12/4/2023 | Marsworth Reedbed |
| Blackcap | 16/2/2023 | A male in Richard Ness's back garden in Hilltop, Chesham |
| Garden Warbler | 8/5/2023 | 2 singing males at Spade Oak Pit |
| Lesser Whitethroat | 2/5/2023 | |
| Whitethroat | 6/4/2023 | A singing male by the railway near Spade Oak GP |
| Dartford Warbler | ********** | ********** |
| Chiffchaff | 1/1/2023 | Emerson Valley |
| Willow Warbler | 1/1/2023 | Emerson Valley - my first ever wintering bird in the county |
| Goldcrest | 1/1/2023 | Emerson Valley |
| Firecrest | 6/2/2023 | Wendover Canal (The Wides) |
| Spotted Flycatcher | 6/6/2023 | Pair around pond in School House garden in Hardmead |
| Pied Flycatcher | 27/4/2023 | Cracking male at Howe Park Wood (photographed) |
| Long-tailed Tit | 1/1/2023 | Emerson Valley |
| Blue Tit | 1/1/2023 | |
| Great Tit | 1/1/2023 | |
| Coal Tit | 5/1/2023 | Hampden House |
| Marsh Tit | 30/1/2023 | Ashridge Forest |
| Nuthatch | 2/1/2023 | Great Hampden House |
| Treecreeper | 1/1/2023 | Emerson Valley |
| Jay | 1/1/2023 | |
| Magpie | 1/1/2023 | |
| Jackdaw | 1/1/2023 | |
| Rook | 1/1/2023 | |
| Carrion Crow | 1/1/2023 | |
| Raven | 5/1/2023 | Pair at Great Hampden House |
| Starling | 1/1/2023 | |
| House Sparrow | 1/1/2023 | Aylesbury |
| Tree Sparrow | 4/9/2023 | 2 juveniles in stubble at Amersham Flood Meadows |
| Chaffinch | 1/1/2023 | |
| Brambling | 4/1/2023 | Just 2 females in the Penn Wood Penna roost |
| Greenfinch | 1/1/2023 | |
| Goldfinch | 1/1/2023 | |
| Siskin | 1/1/2023 | Emerson Valley |
| Linnet | 1/1/2023 | |
| Lesser Redpoll | 1/3/2023 | A single at Grove |
| Common Crossbill | 26/10/2023 | At least a dozen in Wendover Woods (Hale end) |
| Bullfinch | 17/2/2023 | Pair at Chesham Fishing Lakes |
| Hawfinch | 2/1/2023 | Great Hampden House - the 2 wintering males |
| Yellowhammer | 1/1/2023 | Gallows Bridge Farm |
| Reed Bunting | 2/1/2023 | Misbourne LNR |
| Corn Bunting | 26/1/2023 | Smalldean Lane in Saunderton - 30 in setaside |