| RefNo | Title | Source |
| DF/ENT/331/3/30 | Oldroyd, Harold: Correspondence, M | |
| DF/ENT/311/119 | Oldroyd, H: Illustrations for a paper | |
| DF/ENT/307/80 | Oldroyd, Harold | |
| DF/ENT/311/290 | Oldroyd H, Richards O W, and Sabrosky C W: Ruwenzori Expedition [Uganda], 1934-1935 | |
| DF/ADM/1005/55 | Oldroyd, Harold | |
| DF/ENT/331/3/7 | Oldroyd, Harold: Correspondence, D - E | |
| DF/ENT/311/123 | Oldroyd, H: Handbooks for the Identification of British insects | |
| DF/ENT/311/120 | Oldroyd, H: New Therevidae from Argentina | |
| DF/ENT/311/112 | Oldroyd, H: The Genus Trichomachimus (Diptera: Asilidae) | |
| DF/ENT/331/3/3 | Oldroyd, Harold: Correspondence, P-R (B2) | |
| DF/ENT/331/3/4 | Oldroyd, Harold: Correspondence, S-T (C1) | |
| DF/ENT/331/3/42 | Oldroyd, Harold: Monograph of the Asilidae of South Africa | |
| DF/ENT/331/3/10 | Oldroyd, Harold: Correspondence, H | |
| DF/ENT/311/121 | Oldroyd, H: The genus Hoplistomerus Macquart (Diptera: Asilidae) | |
| DF/ENT/311/116 | Oldroyd, H: Handbooks for the identification of British Insects, Vol. 9, part 1: Diptera, Introduction and key to families, 3rd edition (1970). | |
| DF/ENT/311/124 | Oldroyd, H: Large number of drawings of Horseflies of the Ethiopian region. | |
| DF/ENT/331/3/33 | Oldroyd, Harold: Correspondence, S | |
| DF/ENT/331/3/15 | Oldroyd, Harold: Correspondence, P1 | |
| DF/ENT/331/3/17 | Oldroyd, Harold: Correspondence, S1 | |
| DF/ENT/331/3/18 | Oldroyd, Harold: Correspondence, S2 | |
| DF/ENT/331/3/16 | Oldroyd, Harold: Correspondence, P2 | |
| DF/ENT/331/3/21 | Oldroyd, Harold: Correspondence, A - B | |
| DF/ENT/331/3/20 | Oldroyd, Harold: Correspondence, V - Z | |
| DF/ENT/331/3/34 | Oldroyd, Harold: Correspondence, T | |
| DF/ENT/311/115 | Oldroyd, H: Studies of African Asilidae (Diptera): I Asilidae of the Congo Basin | |
| DF/ENT/311/117 | Oldroyd, H: Brachycera | |
| DF/ENT/331/3/13 | Oldroyd, Harold: Correspondence, M1 | |
| DF/ENT/331/3/26 | Oldroyd, Harold: Correspondence, F - G | |
| DF/ENT/331/3/14 | Oldroyd, Harold: Correspondence, M2 | |
| DF/ENT/331/3/6 | Oldroyd, Harold: Correspondence, C (C3) | |
| DF/ENT/311/118 | Oldroyd, H: Asilidae | |
| DF/ENT/331/3/11 | Oldroyd, Harold: Correspondence, H - J | |
| DF/ENT/331/3/12 | Oldroyd, Harold: Correspondence, K - L | |
| DF/ENT/331/3/5 | Oldroyd, Harold: Correspondence, S-V (C2) | |
| DF/ENT/311/255 | Oldroyd, H: Horseflies of the Ethiopian region, part 2 | |
| DF/ENT/331/3/2 | Oldroyd, Harold: Correspondence, B1 | |
| DF/ENT/311/111 | Oldroyd, H: The Genus Pseudorus (Diptera: Asilidae) | |
| DF/ENT/331/3/9 | Oldroyd, Harold: Correspondence, F - G | |
| DF/ENT/331/3/8 | Oldroyd, Harold: Correspondence, E | |
| DF/ENT/311/113 | Oldroyd, H: Diptera from Nepal: Asilidae | |
| DF/ENT/311/110 | Oldroyd, H: Insects and their world, London (1960) | |
| DF/ENT/311/114 | Oldroyd, H: The genus Rhipidocephala (Diptera: Asilidae) | |
| DF/ENT/331/3/39 | Oldroyd, Harold: Proposed international journal of Diptera | |
| DF/ENT/331/3/27 | Oldroyd, Harold: Correspondence, G - H | |
| DF/ENT/331/3/40 | Oldroyd, Harold: Scientific developments and departmental structure, including pollution research | |
| DF/ENT/331/5/2 | Smart, John: 'On the condition of the collection of Diptera in the BM(NH) in 1935', with later notes by Harold Oldroyd | |
| DF/ENT/331/3/25 | Oldroyd, Harold: Correspondence, D - E | |
| DF/ENT/331/3/1 | Oldroyd, Harold: Correspondence, A - B | |
| DF/ENT/331/3/38 | Oldroyd, Harold: Royal Entomological Society, checklist of British insects | |
| DF/ENT/331/3/19 | Oldroyd, Harold: Correspondence, W | |
| DF/ENT/311/109 | Oldroyd, H: A note on the pupa of andrenosona albopylosium (1939) | |
| DF/ENT/331/3/22 | Oldroyd, Harold: Correspondence, B | |
| DF/ENT/311/122 | Oldroyd, H: Notes on the genus Clephydroneura Becker (Diptera: Asilidae) | |
| DF/ENT/311/53 | Edwards, F W: British blood sucking flies by F W Edwards, H Oldroyd and J Smart (1939) | |
| DF/ENT/331/3/24 | Oldroyd, Harold: Correspondence, C - D | |
| DF/ENT/331/3/23 | Oldroyd, Harold: Correspondence, B - C | |
| DF/ENT/331/3/28 | Oldroyd, Harold: Correspondence, H - K | |
| DF/ENT/331/3/29 | Oldroyd, Harold: Correspondence, L - M | |
| DF/ENT/331/3/32 | Oldroyd, Harold: Correspondence, R - S | |
| DF/ENT/331/3/31 | Oldroyd, Harold: Correspondence, N - P | |
| DF/ENT/331/3/35 | Oldroyd, Harold: Correspondence, U - Z | |
| DF/ENT/331/3/36 | Oldroyd, Harold: Animal taxonomy and the Code of Zoological Nomenclature | |
| DF/ENT/331/3/37 | Oldroyd, Harold: 'Principles of Systematics for Medical Entomologists and others' | |
| DF/ENT/331/3/43 | Oldroyd, Harold: Sketch and unfinished artwork for publication | |
| DF/ENT/331/3/44 | Oldroyd, Harold: Visit to Loaisis Research Project, Kumba, British Cameroons [Cameroun] | |
| DF/ENT/311/311 | Oldroyd, Harold: original artwork and photographs of Ethiopian horseflies of the sub-family Tabaninae (Diptera: Tabanidae) | |
| DF/ENT/311/254 | Oldroyd, H: Handbook for the identification of British insects, vol 9, part 4: Diptera: Tabanoidea and Asiliidea (1969) | |
| DF/ENT/311/312 | Oldroyd, Harold: original artwork and photographs of Ethiopian horseflies of the sub-families Chrysopinae, Scepsidinae and Pangoniinae (Diptera: Tabanidae) | |
| DF/ENT/305/94 | Expedition to British Cameroon | |
| DF/ENT/331/3/41 | Oldroyd, Harold: Diptera Catalogue of the 'Oriental' Region | |