| ANGELS ON HORSEBACK | 1957 | ponies |
| THELWELL COUNTRY | 1959 | countryside |
| A PLACE OF YOUR OWN | 1960 | house-hunting |
| THELWELL IN ORBIT | 1961 | space |
| A LEG AT EACH CORNER | 1962 | ponies |
| TOP DOG | 1964 | dogs |
| THELWELL'S RIDING ACADEMY | 1965 | ponies |
| UP THE GARDEN PATH | 1967 | gardening |
| THE COMPLEAT TANGLER | 1967 | fishing |
| THELWELL'S BOOK OF LEISURE | 1968 | leisure pursuits |
| THIS DESIRABLE PLOT | 1970 | house-hunting |
| THE EFFLUENT SOCIETY | 1971 | conservation |
| PENELOPE | 1972 | ponies |
| THREE SHEETS IN THE WIND | 1973 | sailing |
| BELT UP | 1974 | motoring |
| THELWELL GOES WEST | 1975 | Western riding |
| THELWELL'S BRAT RACE | 1977 | children |
| THELWELL'S RIDING FRIEZE | 1977 | ponies |
| A PLANK BRIDGE BY A POOL | 1978 | autobiography |
| THELWELL'S GYMKHANA | 1979 | ponies |
| THELWELL'S HORSE SENSE | 1980 | ponies |
| PONY CAVALCADE | 1981 | ponies |
| A MILLSTONE ROUND MY NECK | 1981 | autobiography |
| HOW TO DRAW PONIES | 1982 | ponies |
| SOME DAMN FOOL'S SIGNED THE RUBENS AGAIN | 1982 | stately homes |
| THELWELL'S MAGNIFICAT | 1983 | cats |
| THELWELL'S SPORTING PRINTS | 1984 | country sports |
| WRESTLING WITH A PENCIL | 1986 | autobiography |
| PLAY IT AS IT LIES | 1987 | golf |
| PONY PANORAMA | 1988 | ponies |
| PENELOPE RIDES AGAIN | 1989 | ponies |
| THE CAT'S PYJAMAS | 1992 | cats |