Lectionary 150
| New Testament manuscript | |
John 1:18 in  Codex Harleianus  | |
| Name | Harley MS 5598 | 
|---|---|
| Text | Gospels | 
| Date | 995 | 
| Script | Greek | 
| Found | John Covel in 1677 at Constantinople | 
| Now at | British Library | 
| Size | 35.2 by 26.7 cm | 
Lectionary 150, designated by siglum ℓ 150 (in the Gregory-Aland numbering), is also known as Codex Harleianus. It is a Greek manuscript of the New Testament, on vellum leaves and one of four extant Greek lectionaries with explicit dates from before 1000.